diff --git a/src/main/scala/millfork/Confusables.scala b/src/main/scala/millfork/Confusables.scala
new file mode 100644
index 00000000..ac3ff634
--- /dev/null
+++ b/src/main/scala/millfork/Confusables.scala
@@ -0,0 +1,800 @@
+package millfork
+
+/**
+  * Based on https://www.unicode.org/Public/security/13.0.0/confusables.txt
+  * @author Karol Stasiak
+  */
+object Confusables {
+
+  lazy val map = Map(
+    '\u0060' -> "\u0027",
+    '\u00A0' -> "\u0020",
+    '\u00B4' -> "\u0027",
+    '\u00B8' -> "\u002C",
+    '\u00C6' -> "\u0041\u0045",
+    '\u00D7' -> "\u0078",
+    '\u00E6' -> "\u0061\u0065",
+    '\u0131' -> "\u0069",
+    '\u0132' -> "\u006C\u004A",
+    '\u0133' -> "\u0069\u006A",
+    '\u0149' -> "\u0027\u006E",
+    '\u0152' -> "\u004F\u0045",
+    '\u0153' -> "\u006F\u0065",
+    '\u017F' -> "\u0066",
+    '\u0181' -> "\u0027\u0042",
+    '\u0184' -> "\u0062",
+    '\u0187' -> "\u0043\u0027",
+    '\u018A' -> "\u0027\u0044",
+    '\u018D' -> "\u0067",
+    '\u0193' -> "\u0047\u0027",
+    '\u0196' -> "\u006C",
+    '\u0198' -> "\u004B\u0027",
+    '\u01A0' -> "\u004F\u0027",
+    '\u01A1' -> "\u006F\u0027",
+    '\u01A4' -> "\u0027\u0050",
+    '\u01A6' -> "\u0052",
+    '\u01A7' -> "\u0032",
+    '\u01AC' -> "\u0027\u0054",
+    '\u01B3' -> "\u0027\u0059",
+    '\u01B7' -> "\u0033",
+    '\u01BC' -> "\u0035",
+    '\u01BD' -> "\u0073",
+    '\u01C0' -> "\u006C",
+    '\u01C1' -> "\u006C\u006C",
+    '\u01C3' -> "\u0021",
+    '\u01C7' -> "\u004C\u004A",
+    '\u01C8' -> "\u004C\u006A",
+    '\u01C9' -> "\u006C\u006A",
+    '\u01CA' -> "\u004E\u004A",
+    '\u01CB' -> "\u004E\u006A",
+    '\u01CC' -> "\u006E\u006A",
+    '\u01F1' -> "\u0044\u005A",
+    '\u01F2' -> "\u0044\u007A",
+    '\u01F3' -> "\u0064\u007A",
+    '\u021C' -> "\u0033",
+    '\u0222' -> "\u0038",
+    '\u0223' -> "\u0038",
+    '\u0241' -> "\u003F",
+    '\u0251' -> "\u0061",
+    '\u0261' -> "\u0067",
+    '\u0263' -> "\u0079",
+    '\u0269' -> "\u0069",
+    '\u026A' -> "\u0069",
+    '\u026F' -> "\u0077",
+    '\u028B' -> "\u0075",
+    '\u028F' -> "\u0079",
+    '\u0294' -> "\u003F",
+    '\u02A3' -> "\u0064\u007A",
+    '\u02A6' -> "\u0074\u0073",
+    '\u02AA' -> "\u006C\u0073",
+    '\u02AB' -> "\u006C\u007A",
+    '\u02B9' -> "\u0027",
+    '\u02BA' -> "\"",
+    '\u02BB' -> "\u0027",
+    '\u02BC' -> "\u0027",
+    '\u02BD' -> "\u0027",
+    '\u02BE' -> "\u0027",
+    '\u02C2' -> "\u003C",
+    '\u02C3' -> "\u003E",
+    '\u02C4' -> "\u005E",
+    '\u02C6' -> "\u005E",
+    '\u02C8' -> "\u0027",
+    '\u02CA' -> "\u0027",
+    '\u02CB' -> "\u0027",
+    '\u02D0' -> "\u003A",
+    '\u02D7' -> "\u002D",
+    '\u02DB' -> "\u0069",
+    '\u02DC' -> "\u007E",
+    '\u02DD' -> "\"",
+    '\u02EE' -> "\"",
+    '\u02F4' -> "\u0027",
+    '\u02F6' -> "\"",
+    '\u02F8' -> "\u003A",
+    '\u0374' -> "\u0027",
+    '\u037A' -> "\u0069",
+    '\u037E' -> "\u003B",
+    '\u037F' -> "\u004A",
+    '\u0384' -> "\u0027",
+    '\u0391' -> "\u0041",
+    '\u0392' -> "\u0042",
+    '\u0395' -> "\u0045",
+    '\u0396' -> "\u005A",
+    '\u0397' -> "\u0048",
+    '\u0399' -> "\u006C",
+    '\u039A' -> "\u004B",
+    '\u039C' -> "\u004D",
+    '\u039D' -> "\u004E",
+    '\u039F' -> "\u004F",
+    '\u03A1' -> "\u0050",
+    '\u03A4' -> "\u0054",
+    '\u03A5' -> "\u0059",
+    '\u03A7' -> "\u0058",
+    '\u03B1' -> "\u0061",
+    '\u03B3' -> "\u0079",
+    '\u03B9' -> "\u0069",
+    '\u03BD' -> "\u0076",
+    '\u03BF' -> "\u006F",
+    '\u03C1' -> "\u0070",
+    '\u03C3' -> "\u006F",
+    '\u03C5' -> "\u0075",
+    '\u03D2' -> "\u0059",
+    '\u03DC' -> "\u0046",
+    '\u03E8' -> "\u0032",
+    '\u03F1' -> "\u0070",
+    '\u03F2' -> "\u0063",
+    '\u03F3' -> "\u006A",
+    '\u03F9' -> "\u0043",
+    '\u03FA' -> "\u004D",
+    '\u0405' -> "\u0053",
+    '\u0406' -> "\u006C",
+    '\u0408' -> "\u004A",
+    '\u0410' -> "\u0041",
+    '\u0412' -> "\u0042",
+    '\u0415' -> "\u0045",
+    '\u0417' -> "\u0033",
+    '\u041A' -> "\u004B",
+    '\u041C' -> "\u004D",
+    '\u041D' -> "\u0048",
+    '\u041E' -> "\u004F",
+    '\u0420' -> "\u0050",
+    '\u0421' -> "\u0043",
+    '\u0422' -> "\u0054",
+    '\u0423' -> "\u0059",
+    '\u0425' -> "\u0058",
+    '\u042B' -> "\u0062\u006C",
+    '\u042C' -> "\u0062",
+    '\u042E' -> "\u006C\u004F",
+    '\u0430' -> "\u0061",
+    '\u0431' -> "\u0036",
+    '\u0433' -> "\u0072",
+    '\u0435' -> "\u0065",
+    '\u043E' -> "\u006F",
+    '\u0440' -> "\u0070",
+    '\u0441' -> "\u0063",
+    '\u0443' -> "\u0079",
+    '\u0445' -> "\u0078",
+    '\u0455' -> "\u0073",
+    '\u0456' -> "\u0069",
+    '\u0458' -> "\u006A",
+    '\u0461' -> "\u0077",
+    '\u0474' -> "\u0056",
+    '\u0475' -> "\u0076",
+    '\u0491' -> "\u0072\u0027",
+    '\u04AE' -> "\u0059",
+    '\u04AF' -> "\u0079",
+    '\u04BB' -> "\u0068",
+    '\u04BD' -> "\u0065",
+    '\u04C0' -> "\u006C",
+    '\u04CF' -> "\u0069",
+    '\u04D4' -> "\u0041\u0045",
+    '\u04D5' -> "\u0061\u0065",
+    '\u04E0' -> "\u0033",
+    '\u0501' -> "\u0064",
+    '\u050C' -> "\u0047",
+    '\u051B' -> "\u0071",
+    '\u051C' -> "\u0057",
+    '\u051D' -> "\u0077",
+    '\u054D' -> "\u0055",
+    '\u054F' -> "\u0053",
+    '\u0555' -> "\u004F",
+    '\u055A' -> "\u0027",
+    '\u055D' -> "\u0027",
+    '\u0561' -> "\u0077",
+    '\u0563' -> "\u0071",
+    '\u0566' -> "\u0071",
+    '\u0570' -> "\u0068",
+    '\u0578' -> "\u006E",
+    '\u057C' -> "\u006E",
+    '\u057D' -> "\u0075",
+    '\u0581' -> "\u0067",
+    '\u0584' -> "\u0066",
+    '\u0585' -> "\u006F",
+    '\u0589' -> "\u003A",
+    '\u05C0' -> "\u006C",
+    '\u05C3' -> "\u003A",
+    '\u05D5' -> "\u006C",
+    '\u05D8' -> "\u0076",
+    '\u05D9' -> "\u0027",
+    '\u05DF' -> "\u006C",
+    '\u05E1' -> "\u006F",
+    '\u05F0' -> "\u006C\u006C",
+    '\u05F1' -> "\u006C\u0027",
+    '\u05F2' -> "\"",
+    '\u05F3' -> "\u0027",
+    '\u05F4' -> "\"",
+    '\u060D' -> "\u002C",
+    '\u0627' -> "\u006C",
+    '\u0647' -> "\u006F",
+    '\u0660' -> "\u002E",
+    '\u0661' -> "\u006C",
+    '\u0665' -> "\u006F",
+    '\u0667' -> "\u0056",
+    '\u066B' -> "\u002C",
+    '\u066D' -> "\u002A",
+    '\u06BE' -> "\u006F",
+    '\u06C1' -> "\u006F",
+    '\u06D4' -> "\u002D",
+    '\u06D5' -> "\u006F",
+    '\u06F0' -> "\u002E",
+    '\u06F1' -> "\u006C",
+    '\u06F5' -> "\u006F",
+    '\u06F7' -> "\u0056",
+    '\u0701' -> "\u002E",
+    '\u0702' -> "\u002E",
+    '\u0703' -> "\u003A",
+    '\u0704' -> "\u003A",
+    '\u07C0' -> "\u004F",
+    '\u07CA' -> "\u006C",
+    '\u07F4' -> "\u0027",
+    '\u07F5' -> "\u0027",
+    '\u07FA' -> "\u005F",
+    '\u0903' -> "\u003A",
+    '\u0966' -> "\u006F",
+    '\u097D' -> "\u003F",
+    '\u09E6' -> "\u004F",
+    '\u09EA' -> "\u0038",
+    '\u09ED' -> "\u0039",
+    '\u0A66' -> "\u006F",
+    '\u0A67' -> "\u0039",
+    '\u0A6A' -> "\u0038",
+    '\u0A83' -> "\u003A",
+    '\u0AE6' -> "\u006F",
+    '\u0B03' -> "\u0038",
+    '\u0B20' -> "\u004F",
+    '\u0B66' -> "\u004F",
+    '\u0B68' -> "\u0039",
+    '\u0BE6' -> "\u006F",
+    '\u0C02' -> "\u006F",
+    '\u0C66' -> "\u006F",
+    '\u0C82' -> "\u006F",
+    '\u0CE6' -> "\u006F",
+    '\u0D02' -> "\u006F",
+    '\u0D20' -> "\u006F",
+    '\u0D66' -> "\u006F",
+    '\u0D6D' -> "\u0039",
+    '\u0D82' -> "\u006F",
+    '\u0E50' -> "\u006F",
+    '\u0ED0' -> "\u006F",
+    '\u101D' -> "\u006F",
+    '\u1040' -> "\u006F",
+    '\u10E7' -> "\u0079",
+    '\u10FF' -> "\u006F",
+    '\u1200' -> "\u0055",
+    '\u12D0' -> "\u004F",
+    '\u13A0' -> "\u0044",
+    '\u13A1' -> "\u0052",
+    '\u13A2' -> "\u0054",
+    '\u13A4' -> "\u004F\u0027",
+    '\u13A5' -> "\u0069",
+    '\u13A9' -> "\u0059",
+    '\u13AA' -> "\u0041",
+    '\u13AB' -> "\u004A",
+    '\u13AC' -> "\u0045",
+    '\u13AE' -> "\u003F",
+    '\u13B3' -> "\u0057",
+    '\u13B7' -> "\u004D",
+    '\u13BB' -> "\u0048",
+    '\u13BD' -> "\u0059",
+    '\u13C0' -> "\u0047",
+    '\u13C2' -> "\u0068",
+    '\u13C3' -> "\u005A",
+    '\u13CE' -> "\u0034",
+    '\u13CF' -> "\u0062",
+    '\u13D2' -> "\u0052",
+    '\u13D4' -> "\u0057",
+    '\u13D5' -> "\u0053",
+    '\u13D9' -> "\u0056",
+    '\u13DA' -> "\u0053",
+    '\u13DE' -> "\u004C",
+    '\u13DF' -> "\u0043",
+    '\u13E2' -> "\u0050",
+    '\u13E6' -> "\u004B",
+    '\u13E7' -> "\u0064",
+    '\u13EE' -> "\u0036",
+    '\u13F3' -> "\u0047",
+    '\u13F4' -> "\u0042",
+    '\u1400' -> "\u003D",
+    '\u142F' -> "\u0056",
+    '\u1433' -> "\u003E",
+    '\u1438' -> "\u003C",
+    '\u144A' -> "\u0027",
+    '\u144C' -> "\u0055",
+    '\u1467' -> "\u0055\u0027",
+    '\u146D' -> "\u0050",
+    '\u146F' -> "\u0064",
+    '\u1472' -> "\u0062",
+    '\u1486' -> "\u0050\u0027",
+    '\u1487' -> "\u0064\u0027",
+    '\u1488' -> "\u0062\u0027",
+    '\u148D' -> "\u004A",
+    '\u14AA' -> "\u004C",
+    '\u14BF' -> "\u0032",
+    '\u1541' -> "\u0078",
+    '\u157C' -> "\u0048",
+    '\u157D' -> "\u0078",
+    '\u1587' -> "\u0052",
+    '\u15AF' -> "\u0062",
+    '\u15B4' -> "\u0046",
+    '\u15C5' -> "\u0041",
+    '\u15DE' -> "\u0044",
+    '\u15EA' -> "\u0044",
+    '\u15F0' -> "\u004D",
+    '\u15F7' -> "\u0042",
+    '\u166D' -> "\u0058",
+    '\u166E' -> "\u0078",
+    '\u1680' -> "\u0020",
+    '\u16B2' -> "\u003C",
+    '\u16B7' -> "\u0058",
+    '\u16C1' -> "\u006C",
+    '\u16CC' -> "\u0027",
+    '\u16D5' -> "\u004B",
+    '\u16D6' -> "\u004D",
+    '\u16EC' -> "\u003A",
+    '\u16ED' -> "\u002B",
+    '\u1735' -> "\u002F",
+    '\u1803' -> "\u003A",
+    '\u1809' -> "\u003A",
+    '\u1CD3' -> "\"",
+    '\u1D04' -> "\u0063",
+    '\u1D0F' -> "\u006F",
+    '\u1D11' -> "\u006F",
+    '\u1D1C' -> "\u0075",
+    '\u1D20' -> "\u0076",
+    '\u1D21' -> "\u0077",
+    '\u1D22' -> "\u007A",
+    '\u1D26' -> "\u0072",
+    '\u1D6B' -> "\u0075\u0065",
+    '\u1D83' -> "\u0067",
+    '\u1D8C' -> "\u0079",
+    '\u1E9D' -> "\u0066",
+    '\u1EFF' -> "\u0079",
+    '\u1FBD' -> "\u0027",
+    '\u1FBE' -> "\u0069",
+    '\u1FBF' -> "\u0027",
+    '\u1FC0' -> "\u007E",
+    '\u1FEF' -> "\u0027",
+    '\u1FFD' -> "\u0027",
+    '\u1FFE' -> "\u0027",
+    '\u2000' -> "\u0020",
+    '\u2001' -> "\u0020",
+    '\u2002' -> "\u0020",
+    '\u2003' -> "\u0020",
+    '\u2004' -> "\u0020",
+    '\u2005' -> "\u0020",
+    '\u2006' -> "\u0020",
+    '\u2007' -> "\u0020",
+    '\u2008' -> "\u0020",
+    '\u2009' -> "\u0020",
+    '\u200A' -> "\u0020",
+    '\u2010' -> "\u002D",
+    '\u2011' -> "\u002D",
+    '\u2012' -> "\u002D",
+    '\u2013' -> "\u002D",
+    '\u2016' -> "\u006C\u006C",
+    '\u2018' -> "\u0027",
+    '\u2019' -> "\u0027",
+    '\u201A' -> "\u002C",
+    '\u201B' -> "\u0027",
+    '\u201C' -> "\"",
+    '\u201D' -> "\"",
+    '\u201F' -> "\"",
+    '\u2024' -> "\u002E",
+    '\u2025' -> "\u002E\u002E",
+    '\u2026' -> "\u002E\u002E\u002E",
+    '\u2028' -> "\u0020",
+    '\u2029' -> "\u0020",
+    '\u202F' -> "\u0020",
+    '\u2032' -> "\u0027",
+    '\u2033' -> "\"",
+    '\u2035' -> "\u0027",
+    '\u2036' -> "\"",
+    '\u2039' -> "\u003C",
+    '\u203A' -> "\u003E",
+    '\u203C' -> "\u0021\u0021",
+    '\u2041' -> "\u002F",
+    '\u2043' -> "\u002D",
+    '\u2044' -> "\u002F",
+    '\u2047' -> "\u003F\u003F",
+    '\u2048' -> "\u003F\u0021",
+    '\u2049' -> "\u0021\u003F",
+    '\u204E' -> "\u002A",
+    '\u2053' -> "\u007E",
+    '\u2057' -> "\"\"",
+    '\u205A' -> "\u003A",
+    '\u205F' -> "\u0020",
+    '\u20A8' -> "\u0052\u0073",
+    '\u20B6' -> "\u006C\u0074",
+    '\u2100' -> "\u0061\u002F\u0063",
+    '\u2101' -> "\u0061\u002F\u0073",
+    '\u2102' -> "\u0043",
+    '\u2105' -> "\u0063\u002F\u006F",
+    '\u2106' -> "\u0063\u002F\u0075",
+    '\u210A' -> "\u0067",
+    '\u210B' -> "\u0048",
+    '\u210C' -> "\u0048",
+    '\u210D' -> "\u0048",
+    '\u210E' -> "\u0068",
+    '\u2110' -> "\u006C",
+    '\u2111' -> "\u006C",
+    '\u2112' -> "\u004C",
+    '\u2113' -> "\u006C",
+    '\u2115' -> "\u004E",
+    '\u2116' -> "\u004E\u006F",
+    '\u2119' -> "\u0050",
+    '\u211A' -> "\u0051",
+    '\u211B' -> "\u0052",
+    '\u211C' -> "\u0052",
+    '\u211D' -> "\u0052",
+    '\u2121' -> "\u0054\u0045\u004C",
+    '\u2124' -> "\u005A",
+    '\u2128' -> "\u005A",
+    '\u212A' -> "\u004B",
+    '\u212C' -> "\u0042",
+    '\u212D' -> "\u0043",
+    '\u212E' -> "\u0065",
+    '\u212F' -> "\u0065",
+    '\u2130' -> "\u0045",
+    '\u2131' -> "\u0046",
+    '\u2133' -> "\u004D",
+    '\u2134' -> "\u006F",
+    '\u2139' -> "\u0069",
+    '\u213B' -> "\u0046\u0041\u0058",
+    '\u213D' -> "\u0079",
+    '\u2145' -> "\u0044",
+    '\u2146' -> "\u0064",
+    '\u2147' -> "\u0065",
+    '\u2148' -> "\u0069",
+    '\u2149' -> "\u006A",
+    '\u2160' -> "\u006C",
+    '\u2161' -> "\u006C\u006C",
+    '\u2162' -> "\u006C\u006C\u006C",
+    '\u2163' -> "\u006C\u0056",
+    '\u2164' -> "\u0056",
+    '\u2165' -> "\u0056\u006C",
+    '\u2166' -> "\u0056\u006C\u006C",
+    '\u2167' -> "\u0056\u006C\u006C\u006C",
+    '\u2168' -> "\u006C\u0058",
+    '\u2169' -> "\u0058",
+    '\u216A' -> "\u0058\u006C",
+    '\u216B' -> "\u0058\u006C\u006C",
+    '\u216C' -> "\u004C",
+    '\u216D' -> "\u0043",
+    '\u216E' -> "\u0044",
+    '\u216F' -> "\u004D",
+    '\u2170' -> "\u0069",
+    '\u2171' -> "\u0069\u0069",
+    '\u2172' -> "\u0069\u0069\u0069",
+    '\u2173' -> "\u0069\u0076",
+    '\u2174' -> "\u0076",
+    '\u2175' -> "\u0076\u0069",
+    '\u2176' -> "\u0076\u0069\u0069",
+    '\u2177' -> "\u0076\u0069\u0069\u0069",
+    '\u2178' -> "\u0069\u0078",
+    '\u2179' -> "\u0078",
+    '\u217A' -> "\u0078\u0069",
+    '\u217B' -> "\u0078\u0069\u0069",
+    '\u217C' -> "\u006C",
+    '\u217D' -> "\u0063",
+    '\u217E' -> "\u0064",
+    '\u217F' -> "\u0072\u006E",
+    '\u2212' -> "\u002D",
+    '\u2215' -> "\u002F",
+    '\u2216' -> "\"",
+    '\u2217' -> "\u002A",
+    '\u221E' -> "\u006F\u006F",
+    '\u2223' -> "\u006C",
+    '\u2225' -> "\u006C\u006C",
+    '\u2228' -> "\u0076",
+    '\u222A' -> "\u0055",
+    '\u2236' -> "\u003A",
+    '\u223C' -> "\u007E",
+    '\u226A' -> "\u003C\u003C",
+    '\u226B' -> "\u003E\u003E",
+    '\u22A4' -> "\u0054",
+    '\u22C1' -> "\u0076",
+    '\u22C3' -> "\u0055",
+    '\u22D8' -> "\u003C\u003C\u003C",
+    '\u22D9' -> "\u003E\u003E\u003E",
+    '\u22FF' -> "\u0045",
+    '\u2373' -> "\u0069",
+    '\u2374' -> "\u0070",
+    '\u237A' -> "\u0061",
+    '\u23FD' -> "\u006C",
+    '\u244A' -> "\"\"",
+    '\u2474' -> "\u0028\u006C\u0029",
+    '\u2475' -> "\u0028\u0032\u0029",
+    '\u2476' -> "\u0028\u0033\u0029",
+    '\u2477' -> "\u0028\u0034\u0029",
+    '\u2478' -> "\u0028\u0035\u0029",
+    '\u2479' -> "\u0028\u0036\u0029",
+    '\u247A' -> "\u0028\u0037\u0029",
+    '\u247B' -> "\u0028\u0038\u0029",
+    '\u247C' -> "\u0028\u0039\u0029",
+    '\u247D' -> "\u0028\u006C\u004F\u0029",
+    '\u247E' -> "\u0028\u006C\u006C\u0029",
+    '\u247F' -> "\u0028\u006C\u0032\u0029",
+    '\u2480' -> "\u0028\u006C\u0033\u0029",
+    '\u2481' -> "\u0028\u006C\u0034\u0029",
+    '\u2482' -> "\u0028\u006C\u0035\u0029",
+    '\u2483' -> "\u0028\u006C\u0036\u0029",
+    '\u2484' -> "\u0028\u006C\u0037\u0029",
+    '\u2485' -> "\u0028\u006C\u0038\u0029",
+    '\u2486' -> "\u0028\u006C\u0039\u0029",
+    '\u2487' -> "\u0028\u0032\u004F\u0029",
+    '\u2488' -> "\u006C\u002E",
+    '\u2489' -> "\u0032\u002E",
+    '\u248A' -> "\u0033\u002E",
+    '\u248B' -> "\u0034\u002E",
+    '\u248C' -> "\u0035\u002E",
+    '\u248D' -> "\u0036\u002E",
+    '\u248E' -> "\u0037\u002E",
+    '\u248F' -> "\u0038\u002E",
+    '\u2490' -> "\u0039\u002E",
+    '\u2491' -> "\u006C\u004F\u002E",
+    '\u2492' -> "\u006C\u006C\u002E",
+    '\u2493' -> "\u006C\u0032\u002E",
+    '\u2494' -> "\u006C\u0033\u002E",
+    '\u2495' -> "\u006C\u0034\u002E",
+    '\u2496' -> "\u006C\u0035\u002E",
+    '\u2497' -> "\u006C\u0036\u002E",
+    '\u2498' -> "\u006C\u0037\u002E",
+    '\u2499' -> "\u006C\u0038\u002E",
+    '\u249A' -> "\u006C\u0039\u002E",
+    '\u249B' -> "\u0032\u004F\u002E",
+    '\u249C' -> "\u0028\u0061\u0029",
+    '\u249D' -> "\u0028\u0062\u0029",
+    '\u249E' -> "\u0028\u0063\u0029",
+    '\u249F' -> "\u0028\u0064\u0029",
+    '\u24A0' -> "\u0028\u0065\u0029",
+    '\u24A1' -> "\u0028\u0066\u0029",
+    '\u24A2' -> "\u0028\u0067\u0029",
+    '\u24A3' -> "\u0028\u0068\u0029",
+    '\u24A4' -> "\u0028\u0069\u0029",
+    '\u24A5' -> "\u0028\u006A\u0029",
+    '\u24A6' -> "\u0028\u006B\u0029",
+    '\u24A7' -> "\u0028\u006C\u0029",
+    '\u24A8' -> "\u0028\u0072\u006E\u0029",
+    '\u24A9' -> "\u0028\u006E\u0029",
+    '\u24AA' -> "\u0028\u006F\u0029",
+    '\u24AB' -> "\u0028\u0070\u0029",
+    '\u24AC' -> "\u0028\u0071\u0029",
+    '\u24AD' -> "\u0028\u0072\u0029",
+    '\u24AE' -> "\u0028\u0073\u0029",
+    '\u24AF' -> "\u0028\u0074\u0029",
+    '\u24B0' -> "\u0028\u0075\u0029",
+    '\u24B1' -> "\u0028\u0076\u0029",
+    '\u24B2' -> "\u0028\u0077\u0029",
+    '\u24B3' -> "\u0028\u0078\u0029",
+    '\u24B4' -> "\u0028\u0079\u0029",
+    '\u24B5' -> "\u0028\u007A\u0029",
+    '\u2571' -> "\u002F",
+    '\u2573' -> "\u0058",
+    '\u2768' -> "\u0028",
+    '\u2769' -> "\u0029",
+    '\u276E' -> "\u003C",
+    '\u276F' -> "\u003E",
+    '\u2772' -> "\u0028",
+    '\u2773' -> "\u0029",
+    '\u2774' -> "\u007B",
+    '\u2775' -> "\u007D",
+    '\u2795' -> "\u002B",
+    '\u2796' -> "\u002D",
+    '\u27CB' -> "\u002F",
+    '\u27CD' -> "\"",
+    '\u27D9' -> "\u0054",
+    '\u292B' -> "\u0078",
+    '\u292C' -> "\u0078",
+    '\u29F5' -> "\"",
+    '\u29F8' -> "\u002F",
+    '\u29F9' -> "\"",
+    '\u2A20' -> "\u003E\u003E",
+    '\u2A2F' -> "\u0078",
+    '\u2A74' -> "\u003A\u003A\u003D",
+    '\u2A75' -> "\u003D\u003D",
+    '\u2A76' -> "\u003D\u003D\u003D",
+    '\u2AA5' -> "\u003E\u003C",
+    '\u2AFB' -> "\u002F\u002F\u002F",
+    '\u2AFD' -> "\u002F\u002F",
+    '\u2C85' -> "\u0072",
+    '\u2C8E' -> "\u0048",
+    '\u2C92' -> "\u006C",
+    '\u2C94' -> "\u004B",
+    '\u2C98' -> "\u004D",
+    '\u2C9A' -> "\u004E",
+    '\u2C9E' -> "\u004F",
+    '\u2C9F' -> "\u006F",
+    '\u2CA2' -> "\u0050",
+    '\u2CA3' -> "\u0070",
+    '\u2CA4' -> "\u0043",
+    '\u2CA5' -> "\u0063",
+    '\u2CA6' -> "\u0054",
+    '\u2CA8' -> "\u0059",
+    '\u2CAC' -> "\u0058",
+    '\u2CB4' -> "\u003C\u00B7",
+    '\u2CBA' -> "\u002D",
+    '\u2CC6' -> "\u002F",
+    '\u2CCA' -> "\u0039",
+    '\u2CCC' -> "\u0033",
+    '\u2CD0' -> "\u004C",
+    '\u2CD2' -> "\u0036",
+    '\u2CF9' -> "\"\"",
+    '\u2D38' -> "\u0056",
+    '\u2D39' -> "\u0045",
+    '\u2D4F' -> "\u006C",
+    '\u2D51' -> "\u0021",
+    '\u2D54' -> "\u004F",
+    '\u2D55' -> "\u0051",
+    '\u2D5D' -> "\u0058",
+    '\u2E28' -> "\u0028\u0028",
+    '\u2E29' -> "\u0029\u0029",
+    '\u2E40' -> "\u003D",
+    '\u2F02' -> "\"",
+    '\u2F03' -> "\u002F",
+    '\u3003' -> "\"",
+    '\u3007' -> "\u004F",
+    '\u3014' -> "\u0028",
+    '\u3015' -> "\u0029",
+    '\u3033' -> "\u002F",
+    '\u30A0' -> "\u003D",
+    '\u30CE' -> "\u002F",
+    '\u31D3' -> "\u002F",
+    '\u31D4' -> "\"",
+    '\u4E36' -> "\"",
+    '\u4E3F' -> "\u002F",
+    '\uA4D0' -> "\u0042",
+    '\uA4D1' -> "\u0050",
+    '\uA4D2' -> "\u0064",
+    '\uA4D3' -> "\u0044",
+    '\uA4D4' -> "\u0054",
+    '\uA4D6' -> "\u0047",
+    '\uA4D7' -> "\u004B",
+    '\uA4D9' -> "\u004A",
+    '\uA4DA' -> "\u0043",
+    '\uA4DC' -> "\u005A",
+    '\uA4DD' -> "\u0046",
+    '\uA4DF' -> "\u004D",
+    '\uA4E0' -> "\u004E",
+    '\uA4E1' -> "\u004C",
+    '\uA4E2' -> "\u0053",
+    '\uA4E3' -> "\u0052",
+    '\uA4E6' -> "\u0056",
+    '\uA4E7' -> "\u0048",
+    '\uA4EA' -> "\u0057",
+    '\uA4EB' -> "\u0058",
+    '\uA4EC' -> "\u0059",
+    '\uA4EE' -> "\u0041",
+    '\uA4F0' -> "\u0045",
+    '\uA4F2' -> "\u006C",
+    '\uA4F3' -> "\u004F",
+    '\uA4F4' -> "\u0055",
+    '\uA4F8' -> "\u002E",
+    '\uA4F9' -> "\u002C",
+    '\uA4FA' -> "\u002E\u002E",
+    '\uA4FB' -> "\u002E\u002C",
+    '\uA4FD' -> "\u003A",
+    '\uA4FE' -> "\u002D\u002E",
+    '\uA4FF' -> "\u003D",
+    '\uA60E' -> "\u002E",
+    '\uA644' -> "\u0032",
+    '\uA647' -> "\u0069",
+    '\uA698' -> "\u004F\u004F",
+    '\uA699' -> "\u006F\u006F",
+    '\uA6DF' -> "\u0056",
+    '\uA6EB' -> "\u003F",
+    '\uA6EF' -> "\u0032",
+    '\uA728' -> "\u0054\u0033",
+    '\uA731' -> "\u0073",
+    '\uA732' -> "\u0041\u0041",
+    '\uA733' -> "\u0061\u0061",
+    '\uA734' -> "\u0041\u004F",
+    '\uA735' -> "\u0061\u006F",
+    '\uA736' -> "\u0041\u0055",
+    '\uA737' -> "\u0061\u0075",
+    '\uA738' -> "\u0041\u0056",
+    '\uA739' -> "\u0061\u0076",
+    '\uA73A' -> "\u0041\u0056",
+    '\uA73B' -> "\u0061\u0076",
+    '\uA73C' -> "\u0041\u0059",
+    '\uA73D' -> "\u0061\u0079",
+    '\uA74E' -> "\u004F\u004F",
+    '\uA74F' -> "\u006F\u006F",
+    '\uA75A' -> "\u0032",
+    '\uA76A' -> "\u0033",
+    '\uA76E' -> "\u0039",
+    '\uA777' -> "\u0074\u0066",
+    '\uA778' -> "\u0026",
+    '\uA789' -> "\u003A",
+    '\uA78C' -> "\u0027",
+    '\uA798' -> "\u0046",
+    '\uA799' -> "\u0066",
+    '\uA79F' -> "\u0075",
+    '\uA7AB' -> "\u0033",
+    '\uA7B2' -> "\u004A",
+    '\uA7B3' -> "\u0058",
+    '\uA7B4' -> "\u0042",
+    '\uAB32' -> "\u0065",
+    '\uAB35' -> "\u0066",
+    '\uAB3D' -> "\u006F",
+    '\uAB47' -> "\u0072",
+    '\uAB48' -> "\u0072",
+    '\uAB4E' -> "\u0075",
+    '\uAB52' -> "\u0075",
+    '\uAB5A' -> "\u0079",
+    '\uAB63' -> "\u0075\u006F",
+    '\uAB75' -> "\u0069",
+    '\uAB81' -> "\u0072",
+    '\uAB83' -> "\u0077",
+    '\uAB93' -> "\u007A",
+    '\uABA9' -> "\u0076",
+    '\uABAA' -> "\u0073",
+    '\uABAF' -> "\u0063",
+    '\uFB00' -> "\u0066\u0066",
+    '\uFB01' -> "\u0066\u0069",
+    '\uFB02' -> "\u0066\u006C",
+    '\uFB03' -> "\u0066\u0066\u0069",
+    '\uFB04' -> "\u0066\u0066\u006C",
+    '\uFB06' -> "\u0073\u0074",
+    '\uFBA6' -> "\u006F",
+    '\uFBA7' -> "\u006F",
+    '\uFBA8' -> "\u006F",
+    '\uFBA9' -> "\u006F",
+    '\uFBAA' -> "\u006F",
+    '\uFBAB' -> "\u006F",
+    '\uFBAC' -> "\u006F",
+    '\uFBAD' -> "\u006F",
+    '\uFD3E' -> "\u0028",
+    '\uFD3F' -> "\u0029",
+    '\uFE30' -> "\u003A",
+    '\uFE4D' -> "\u005F",
+    '\uFE4E' -> "\u005F",
+    '\uFE4F' -> "\u005F",
+    '\uFE58' -> "\u002D",
+    '\uFE68' -> "\"",
+    '\uFE8D' -> "\u006C",
+    '\uFE8E' -> "\u006C",
+    '\uFEE9' -> "\u006F",
+    '\uFEEA' -> "\u006F",
+    '\uFEEB' -> "\u006F",
+    '\uFEEC' -> "\u006F",
+    '\uFF01' -> "\u0021",
+    '\uFF02' -> "\"",
+    '\uFF07' -> "\u0027",
+    '\uFF1A' -> "\u003A",
+    '\uFF21' -> "\u0041",
+    '\uFF22' -> "\u0042",
+    '\uFF23' -> "\u0043",
+    '\uFF25' -> "\u0045",
+    '\uFF28' -> "\u0048",
+    '\uFF29' -> "\u006C",
+    '\uFF2A' -> "\u004A",
+    '\uFF2B' -> "\u004B",
+    '\uFF2D' -> "\u004D",
+    '\uFF2E' -> "\u004E",
+    '\uFF2F' -> "\u004F",
+    '\uFF30' -> "\u0050",
+    '\uFF33' -> "\u0053",
+    '\uFF34' -> "\u0054",
+    '\uFF38' -> "\u0058",
+    '\uFF39' -> "\u0059",
+    '\uFF3A' -> "\u005A",
+    '\uFF3B' -> "\u0028",
+    '\uFF3C' -> "\"",
+    '\uFF3D' -> "\u0029",
+    '\uFF40' -> "\u0027",
+    '\uFF41' -> "\u0061",
+    '\uFF43' -> "\u0063",
+    '\uFF45' -> "\u0065",
+    '\uFF47' -> "\u0067",
+    '\uFF48' -> "\u0068",
+    '\uFF49' -> "\u0069",
+    '\uFF4A' -> "\u006A",
+    '\uFF4C' -> "\u006C",
+    '\uFF4F' -> "\u006F",
+    '\uFF50' -> "\u0070",
+    '\uFF53' -> "\u0073",
+    '\uFF56' -> "\u0076",
+    '\uFF58' -> "\u0078",
+    '\uFF59' -> "\u0079",
+    '\uFFE8' -> "\u006C"
+  )
+}
diff --git a/src/main/scala/millfork/parser/MfParser.scala b/src/main/scala/millfork/parser/MfParser.scala
index cdc94010..519e8f44 100644
--- a/src/main/scala/millfork/parser/MfParser.scala
+++ b/src/main/scala/millfork/parser/MfParser.scala
@@ -5,12 +5,13 @@ import java.nio.file.{Files, Paths}
 import java.util
 
 import fastparse.all._
+import fastparse.core.Parsed.Failure
 import millfork.assembly.Elidability
 import millfork.env._
 import millfork.error.{ConsoleLogger, Logger}
 import millfork.node._
 import millfork.output.{DivisibleAlignment, MemoryAlignment, NoAlignment}
-import millfork.{CompilationFlag, CompilationOptions, SeparatedList}
+import millfork.{CompilationFlag, CompilationOptions, Confusables, SeparatedList}
 
 import scala.collection.immutable.BitSet
 
@@ -29,7 +30,23 @@ abstract class MfParser[T](fileId: String, input: String, currentDirectory: Stri
 
   val enableDebuggingOptions: Boolean = options.flag(CompilationFlag.EnableInternalTestSyntax)
 
-  def toAst: Parsed[Program] = program.parse(input + "\n\n\n")
+  def toAst: Parsed[Program] = {
+    val parse = program.parse(input + "\n\n\n")
+    parse match {
+      case _:Failure[_, _] =>
+        val c = input(lastPosition.cursor)
+        if (c >= 0x100 || c < 0x20 || c == '`') {
+          log.error("Invalid character U+%04X %s".format(c.toInt, Character.getName(c)), Some(lastPosition))
+          Confusables.map.get(c) match {
+            case Some(ascii) =>
+              log.info(s"Did you mean: $ascii")
+            case _ =>
+          }
+        }
+      case _ =>
+    }
+    parse
+  }
 
   private val lineStarts: Array[Int] = (0 +: input.zipWithIndex.filter(_._1 == '\n').map(_._2)).toArray
 
diff --git a/src/test/scala/millfork/test/ParserSuite.scala b/src/test/scala/millfork/test/ParserSuite.scala
index c7dabc18..b01f4b0f 100644
--- a/src/test/scala/millfork/test/ParserSuite.scala
+++ b/src/test/scala/millfork/test/ParserSuite.scala
@@ -1,7 +1,7 @@
 package millfork.test
 
 import millfork.Cpu
-import millfork.test.emu.{EmuUnoptimizedCrossPlatformRun, ShouldNotCompile}
+import millfork.test.emu.{EmuUnoptimizedCrossPlatformRun, ShouldNotCompile, ShouldNotParse}
 import org.scalatest.{FunSuite, Matchers}
 
 /**
@@ -53,4 +53,11 @@ class ParserSuite extends FunSuite with Matchers  {
       m.readByte(0xc003) should equal(5)
     }
   }
+
+  test("I hate Millfork, it won't let me prank my coworkers") {
+    ShouldNotParse(
+      """
+        |const array a = ‟aa"
+        |""".stripMargin)
+  }
 }
diff --git a/src/test/scala/millfork/test/emu/ShouldNotCompile.scala b/src/test/scala/millfork/test/emu/ShouldNotCompile.scala
index 6d0f3257..115812a1 100644
--- a/src/test/scala/millfork/test/emu/ShouldNotCompile.scala
+++ b/src/test/scala/millfork/test/emu/ShouldNotCompile.scala
@@ -32,7 +32,11 @@ object ShouldNotCompile extends Matchers {
     val log = TestErrorReporting.log
     println(source)
     val platform = EmuPlatform.get(cpu)
-    val options = CompilationOptions(platform, Map(CompilationFlag.LenientTextEncoding -> true), None, platform.zpRegisterSize, Map(), EmuPlatform.textCodecRepository, JobContext(log, new LabelGenerator))
+    val flags = CpuFamily.forType(cpu) match {
+      case CpuFamily.M6809 => Map(CompilationFlag.LenientTextEncoding -> true, CompilationFlag.UseUForStack -> true)
+      case _ => Map(CompilationFlag.LenientTextEncoding -> true)
+    }
+    val options = CompilationOptions(platform, flags, None, platform.zpRegisterSize, Map(), EmuPlatform.textCodecRepository, JobContext(log, new LabelGenerator))
     log.hasErrors = false
     log.verbosity = 999
     var effectiveSource = source
diff --git a/src/test/scala/millfork/test/emu/ShouldNotParse.scala b/src/test/scala/millfork/test/emu/ShouldNotParse.scala
index 2b25ee01..59fd04b1 100644
--- a/src/test/scala/millfork/test/emu/ShouldNotParse.scala
+++ b/src/test/scala/millfork/test/emu/ShouldNotParse.scala
@@ -22,7 +22,11 @@ object ShouldNotParse extends Matchers {
     val log = TestErrorReporting.log
     println(source)
     val platform = EmuPlatform.get(cpu)
-    val options = CompilationOptions(platform, Map(CompilationFlag.LenientTextEncoding -> true), None, platform.zpRegisterSize, Map(), EmuPlatform.textCodecRepository, JobContext(log, new LabelGenerator))
+    val flags = CpuFamily.forType(cpu) match {
+      case CpuFamily.M6809 => Map(CompilationFlag.LenientTextEncoding -> true, CompilationFlag.UseUForStack -> true)
+      case _ => Map(CompilationFlag.LenientTextEncoding -> true)
+    }
+    val options = CompilationOptions(platform, flags, None, platform.zpRegisterSize, Map(), EmuPlatform.textCodecRepository, JobContext(log, new LabelGenerator))
     log.hasErrors = false
     log.verbosity = 999
     var effectiveSource = source