diff --git a/src/com/bytezone/diskbrowser/visicalc/Count.java b/src/com/bytezone/diskbrowser/visicalc/Count.java
index 312989d..4364272 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Count.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Count.java
@@ -1,13 +1,10 @@
 package com.bytezone.diskbrowser.visicalc;
 
-class Count extends Function
+class Count extends RangeFunction
 {
-  private final Range range;
-
   public Count (Sheet parent, String text)
   {
     super (parent, text);
-    range = getRange (text);
   }
 
   @Override
diff --git a/src/com/bytezone/diskbrowser/visicalc/Function.java b/src/com/bytezone/diskbrowser/visicalc/Function.java
index c06a6fb..b5d8afe 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Function.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Function.java
@@ -1,8 +1,5 @@
 package com.bytezone.diskbrowser.visicalc;
 
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
 // http://www.bricklin.com/history/refcard1.htm
 // Functions:
 // @AVERAGE
@@ -26,10 +23,6 @@ import java.util.regex.Pattern;
 
 abstract class Function implements Value
 {
-  private static final Pattern rangePattern = Pattern
-      .compile ("\\(([A-B]?[A-Z])([0-9]{1,3})\\.\\.\\.([A-B]?[A-Z])([0-9]{1,3})\\)?");
-  private static final Pattern addressList = Pattern.compile ("\\(([^,]+(,[^,]+)*)\\)");
-
   protected final Sheet parent;
   protected String functionName;
   protected String functionText;
@@ -158,46 +151,6 @@ abstract class Function implements Value
     return isNotAvailable () ? "NA" : isError () ? "Error" : isNotANumber () ? "NaN" : "";
   }
 
-  protected Range getRange (String text)
-  {
-    Range range = null;
-    Matcher m = rangePattern.matcher (text);
-    if (m.find ())
-    {
-      Address fromAddress = new Address (m.group (1), m.group (2));
-      Address toAddress = new Address (m.group (3), m.group (4));
-      range = new Range (fromAddress, toAddress);
-    }
-
-    if (range != null)
-      return range;
-
-    m = addressList.matcher (text);
-    if (m.find ())
-    {
-      String[] cells = m.group (1).split (",");
-      range = new Range (cells);
-    }
-
-    if (range != null)
-      return range;
-
-    int pos = text.indexOf ("...");
-    if (pos > 0)
-    {
-      String from = text.substring (0, pos);
-      String to = text.substring (pos + 3);
-      Address fromAddress = new Address (from);
-      Address toAddress = new Address (to);
-      range = new Range (fromAddress, toAddress);
-    }
-
-    if (range == null)
-      System.out.printf ("null range [%s]%n", text);
-
-    return range;
-  }
-
   @Override
   public String toString ()
   {
diff --git a/src/com/bytezone/diskbrowser/visicalc/Lookup.java b/src/com/bytezone/diskbrowser/visicalc/Lookup.java
index 0eb389b..fc211e3 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Lookup.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Lookup.java
@@ -1,8 +1,7 @@
 package com.bytezone.diskbrowser.visicalc;
 
-class Lookup extends Function
+class Lookup extends RangeFunction
 {
-  Range range;
   String sourceText;
   String rangeText;
   Expression source;
@@ -20,13 +19,9 @@ class Lookup extends Function
   public Value calculate ()
   {
     if (source == null)
-    {
       source = new Expression (parent, sourceText);
-      range = getRange (rangeText);
-    }
 
     source.calculate ();
-    //    System.out.println ("calculated source");
     if (source.isError () || source.isNotAvailable ())
     {
       valueType = source.getValueType ();
@@ -53,9 +48,7 @@ class Lookup extends Function
       valueType = ValueType.VALUE;
     }
     else
-    {
       System.out.println ("Target is null!");
-    }
 
     return this;
   }
diff --git a/src/com/bytezone/diskbrowser/visicalc/Max.java b/src/com/bytezone/diskbrowser/visicalc/Max.java
index f8b990f..88d77fa 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Max.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Max.java
@@ -1,13 +1,10 @@
 package com.bytezone.diskbrowser.visicalc;
 
-class Max extends Function
+class Max extends RangeFunction
 {
-  private final Range range;
-
   public Max (Sheet parent, String text)
   {
     super (parent, text);
-    range = getRange (text);
   }
 
   @Override
diff --git a/src/com/bytezone/diskbrowser/visicalc/Min.java b/src/com/bytezone/diskbrowser/visicalc/Min.java
index 8a7d82c..daa350d 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Min.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Min.java
@@ -1,13 +1,10 @@
 package com.bytezone.diskbrowser.visicalc;
 
-class Min extends Function
+class Min extends RangeFunction
 {
-  private final Range range;
-
   public Min (Sheet parent, String text)
   {
     super (parent, text);
-    range = getRange (text);
   }
 
   @Override
diff --git a/src/com/bytezone/diskbrowser/visicalc/Npv.java b/src/com/bytezone/diskbrowser/visicalc/Npv.java
index f2be91c..a589b31 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Npv.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Npv.java
@@ -1,23 +1,21 @@
 package com.bytezone.diskbrowser.visicalc;
 
-public class Npv extends Function
+public class Npv extends RangeFunction
 {
-  private final String valueText;
-  private final String rangeText;
-
-  private final Expression valueExp;
-  private final Range range;
+  //  private final String valueText;
+  //  private final String rangeText;
+  //
+  //  private final Expression valueExp;
 
   Npv (Sheet parent, String text)
   {
     super (parent, text);
 
-    int pos = text.indexOf (',');
-    valueText = text.substring (8, pos);
-    rangeText = text.substring (pos + 1, text.length () - 1);
-
-    valueExp = new Expression (parent, valueText);
-    range = getRange (rangeText);
+    //    int pos = text.indexOf (',');
+    //    valueText = text.substring (8, pos);
+    //    rangeText = text.substring (pos + 1, text.length () - 1);
+    //
+    //    valueExp = new Expression (parent, valueText);
   }
 
   @Override
diff --git a/src/com/bytezone/diskbrowser/visicalc/RangeFunction.java b/src/com/bytezone/diskbrowser/visicalc/RangeFunction.java
new file mode 100644
index 0000000..9782c95
--- /dev/null
+++ b/src/com/bytezone/diskbrowser/visicalc/RangeFunction.java
@@ -0,0 +1,58 @@
+package com.bytezone.diskbrowser.visicalc;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public abstract class RangeFunction extends Function
+{
+  private static final Pattern rangePattern = Pattern
+      .compile ("\\(([A-B]?[A-Z])([0-9]{1,3})\\.\\.\\.([A-B]?[A-Z])([0-9]{1,3})\\)?");
+  private static final Pattern addressList = Pattern.compile ("\\(([^,]+(,[^,]+)*)\\)");
+  protected final Range range;
+
+  public RangeFunction (Sheet parent, String text)
+  {
+    super (parent, text);
+    range = getRange (text);
+  }
+
+  protected Range getRange (String text)
+  {
+    Range range = null;
+    Matcher m = rangePattern.matcher (text);
+    if (m.find ())
+    {
+      Address fromAddress = new Address (m.group (1), m.group (2));
+      Address toAddress = new Address (m.group (3), m.group (4));
+      range = new Range (fromAddress, toAddress);
+    }
+
+    if (range != null)
+      return range;
+
+    m = addressList.matcher (text);
+    if (m.find ())
+    {
+      String[] cells = m.group (1).split (",");
+      range = new Range (cells);
+    }
+
+    if (range != null)
+      return range;
+
+    int pos = text.indexOf ("...");
+    if (pos > 0)
+    {
+      String from = text.substring (0, pos);
+      String to = text.substring (pos + 3);
+      Address fromAddress = new Address (from);
+      Address toAddress = new Address (to);
+      range = new Range (fromAddress, toAddress);
+    }
+
+    if (range == null)
+      System.out.printf ("null range [%s]%n", text);
+
+    return range;
+  }
+}
\ No newline at end of file
diff --git a/src/com/bytezone/diskbrowser/visicalc/Sum.java b/src/com/bytezone/diskbrowser/visicalc/Sum.java
index d615e92..d97fdd9 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Sum.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Sum.java
@@ -1,13 +1,10 @@
 package com.bytezone.diskbrowser.visicalc;
 
-class Sum extends Function
+class Sum extends RangeFunction
 {
-  private final Range range;
-
   public Sum (Sheet parent, String text)
   {
     super (parent, text);
-    range = getRange (text);
   }
 
   @Override