diff --git a/src/com/bytezone/diskbrowser/visicalc/Average.java b/src/com/bytezone/diskbrowser/visicalc/Average.java
index bda0757..808799c 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Average.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Average.java
@@ -2,13 +2,15 @@ package com.bytezone.diskbrowser.visicalc;
 
 public class Average extends Function
 {
-  private final Range range;
+  //  private final Range range;
+  private final ExpressionList list;
 
   public Average (Sheet parent, Cell cell, String text)
   {
     super (parent, cell, text);
 
-    range = new Range (parent, text);
+    //    range = new Range (parent, cell, text);           // use list instead
+    list = new ExpressionList (parent, cell, functionText);
   }
 
   @Override
@@ -17,20 +19,21 @@ public class Average extends Function
     double total = 0.0;
     int totalChecked = 0;
 
-    for (Address address : range)
+    for (Value v : list)
     {
-      Cell cell = parent.getCell (address);
+      v.calculate ();
+      //      Cell cell = parent.getCell (address);
 
-      if (cell.isValueType (ValueType.NA))
+      if (v.isValueType (ValueType.NA))
         continue;
 
-      if (!cell.isValueType (ValueType.VALUE))
+      if (!v.isValueType (ValueType.VALUE))
       {
-        valueType = cell.getValueType ();
+        valueType = v.getValueType ();
         return;
       }
 
-      total += cell.getValue ();
+      total += v.getValue ();
       totalChecked++;
     }
 
diff --git a/src/com/bytezone/diskbrowser/visicalc/Cell.java b/src/com/bytezone/diskbrowser/visicalc/Cell.java
index 3aca854..09fcb96 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Cell.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Cell.java
@@ -165,7 +165,6 @@ class Cell extends AbstractValue implements Comparable<Cell>
     switch (cellType)
     {
       case LABEL:
-        //        if (fmtChar == ' ' || fmtChar == 'I' || fmtChar == '$')
         if (fmtChar != 'R')
           fmtChar = 'L';
         return Format.justify (label, colWidth, fmtChar);
@@ -201,8 +200,10 @@ class Cell extends AbstractValue implements Comparable<Cell>
   @Override
   public ValueType getValueType ()
   {
-    if (cellType == CellType.EMPTY || cellType == CellType.LABEL
-        || cellType == CellType.REPEATING_CHARACTER)
+    if (cellType == CellType.EMPTY)
+      return ValueType.NA;
+
+    if (cellType == CellType.LABEL || cellType == CellType.REPEATING_CHARACTER)
       return ValueType.VALUE;
 
     return value.getValueType ();
diff --git a/src/com/bytezone/diskbrowser/visicalc/Choose.java b/src/com/bytezone/diskbrowser/visicalc/Choose.java
index 12b75e9..05c2023 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Choose.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Choose.java
@@ -15,7 +15,7 @@ public class Choose extends Function
     sourceText = text.substring (8, pos);
     source = new Number (sourceText);
     rangeText = text.substring (pos + 1, text.length () - 1);
-    range = new Range (parent, rangeText);
+    range = new Range (parent, cell, rangeText);
 
     values.add (source);
   }
diff --git a/src/com/bytezone/diskbrowser/visicalc/Count.java b/src/com/bytezone/diskbrowser/visicalc/Count.java
index 413f38d..140cd60 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Count.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Count.java
@@ -2,13 +2,15 @@ package com.bytezone.diskbrowser.visicalc;
 
 class Count extends Function
 {
-  private final Range range;
+  private final ExpressionList list;
+  private final boolean isRange;
 
   public Count (Sheet parent, Cell cell, String text)
   {
     super (parent, cell, text);
 
-    range = new Range (parent, text);
+    list = new ExpressionList (parent, cell, functionText);
+    isRange = functionText.indexOf ("...") > 0;
   }
 
   @Override
@@ -17,20 +19,23 @@ class Count extends Function
     value = 0;
     valueType = ValueType.VALUE;
 
-    for (Address address : range)
-    {
-      Cell cell = parent.getCell (address);
-
-      if (cell.isValueType (ValueType.NA))
-        continue;
-
-      if (!cell.isValueType (ValueType.VALUE))
+    if (!isRange)
+      value = list.size ();
+    else
+      for (Value v : list)
       {
-        valueType = cell.getValueType ();
-        return;
-      }
+        v.calculate ();
 
-      value++;
-    }
+        if (v instanceof Cell && v.isValueType (ValueType.NA))
+          continue;
+
+        if (!v.isValueType (ValueType.VALUE))
+        {
+          valueType = v.getValueType ();
+          return;
+        }
+
+        value++;
+      }
   }
 }
\ No newline at end of file
diff --git a/src/com/bytezone/diskbrowser/visicalc/ExpressionList.java b/src/com/bytezone/diskbrowser/visicalc/ExpressionList.java
index 8635a5c..67701d7 100644
--- a/src/com/bytezone/diskbrowser/visicalc/ExpressionList.java
+++ b/src/com/bytezone/diskbrowser/visicalc/ExpressionList.java
@@ -1,22 +1,55 @@
 package com.bytezone.diskbrowser.visicalc;
 
-import java.util.ArrayList;
 import java.util.Iterator;
-import java.util.List;
+import java.util.regex.Pattern;
 
-public class ExpressionList implements Iterable<Expression>
+public class ExpressionList extends AbstractValue implements Iterable<Value>
 {
-  private final Sheet parent;
-  List<Expression> expressions = new ArrayList<Expression> ();
+  private static final Pattern cellAddress = Pattern.compile ("[A-B]?[A-Z][0-9]{1,3}");
+  private static final Pattern addressList = Pattern.compile ("\\(([^,]+(,[^,]+)*)\\)");
 
-  public ExpressionList (Sheet parent, String rangeText)
+  private final Sheet parent;
+  //  private final List<Expression> expressions = new ArrayList<Expression> ();
+
+  public ExpressionList (Sheet parent, Cell cell, String text)
   {
+    super ("expL");
     this.parent = parent;
+
+    int pos = text.indexOf ("...");
+    if (pos > 0)
+    {
+      String fromAddress = text.substring (0, pos);
+      String toAddress = text.substring (pos + 3);
+
+      Address from = new Address (fromAddress);
+      Address to = new Address (toAddress);
+
+      Range range = new Range (parent, from, to);
+      for (Address address : range)
+        values.add (parent.getCell (address));
+
+      return;
+    }
+
+    String[] chunks = text.split (",");
+    for (String s : chunks)
+    {
+      //      System.out.println (s);
+      Value v = new Expression (parent, cell, s).reduce ();
+      //      expressions.add (expression);
+      values.add (v);
+    }
+  }
+
+  public int size ()
+  {
+    return values.size ();
   }
 
   @Override
-  public Iterator<Expression> iterator ()
+  public Iterator<Value> iterator ()
   {
-    return expressions.iterator ();
+    return values.iterator ();
   }
 }
\ No newline at end of file
diff --git a/src/com/bytezone/diskbrowser/visicalc/Lookup.java b/src/com/bytezone/diskbrowser/visicalc/Lookup.java
index 87683d2..20496c2 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Lookup.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Lookup.java
@@ -17,7 +17,7 @@ class Lookup extends Function
     source = new Expression (parent, cell, sourceText);
 
     rangeText = text.substring (pos + 1, text.length () - 1);
-    range = new Range (parent, rangeText);
+    range = new Range (parent, cell, rangeText);
 
     values.add (source);
   }
diff --git a/src/com/bytezone/diskbrowser/visicalc/Max.java b/src/com/bytezone/diskbrowser/visicalc/Max.java
index e602d83..d2e7f8f 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Max.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Max.java
@@ -2,13 +2,13 @@ package com.bytezone.diskbrowser.visicalc;
 
 class Max extends Function
 {
-  private final Range range;
+  private final ExpressionList list;
 
   public Max (Sheet parent, Cell cell, String text)
   {
     super (parent, cell, text);
 
-    range = new Range (parent, text);
+    list = new ExpressionList (parent, cell, functionText);
   }
 
   @Override
@@ -17,19 +17,16 @@ class Max extends Function
     value = Double.MIN_VALUE;
     int totalChecked = 0;
 
-    for (Address address : range)
+    for (Value v : list)
     {
-      Cell cell = parent.getCell (address);
-      if (cell.isValueType (ValueType.NA))
-        continue;
-
-      if (!cell.isValueType (ValueType.VALUE))
+      v.calculate ();
+      if (!v.isValueType (ValueType.VALUE))
       {
         valueType = cell.getValueType ();
         break;
       }
 
-      double temp = cell.getValue ();
+      double temp = v.getValue ();
       if (temp > value)
         value = temp;
       totalChecked++;
diff --git a/src/com/bytezone/diskbrowser/visicalc/Min.java b/src/com/bytezone/diskbrowser/visicalc/Min.java
index 290e37f..0d33251 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Min.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Min.java
@@ -2,14 +2,14 @@ package com.bytezone.diskbrowser.visicalc;
 
 class Min extends Function
 {
-  private final Range range;
+  private final ExpressionList list;
 
   public Min (Sheet parent, Cell cell, String text)
   {
     super (parent, cell, text);
 
     System.out.println (text);
-    range = new Range (parent, text);
+    list = new ExpressionList (parent, cell, functionText);
   }
 
   @Override
@@ -18,19 +18,16 @@ class Min extends Function
     value = Double.MAX_VALUE;
     int totalChecked = 0;
 
-    for (Address address : range)
+    for (Value v : list)
     {
-      Cell cell = parent.getCell (address);
-      if (cell.isValueType (ValueType.NA))
-        continue;
-
-      if (!cell.isValueType (ValueType.VALUE))
+      v.calculate ();
+      if (!v.isValueType (ValueType.VALUE))
       {
         valueType = cell.getValueType ();
         break;
       }
 
-      double temp = cell.getValue ();
+      double temp = v.getValue ();
       if (temp < value)
         value = temp;
       totalChecked++;
diff --git a/src/com/bytezone/diskbrowser/visicalc/Npv.java b/src/com/bytezone/diskbrowser/visicalc/Npv.java
index 2b13fe1..0116acf 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Npv.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Npv.java
@@ -17,7 +17,7 @@ public class Npv extends Function
     rangeText = text.substring (pos + 1, text.length () - 1);
 
     rateExp = new Expression (parent, cell, valueText);
-    range = new Range (parent, rangeText);
+    range = new Range (parent, cell, rangeText);
 
     values.add (rateExp);
   }
diff --git a/src/com/bytezone/diskbrowser/visicalc/Range.java b/src/com/bytezone/diskbrowser/visicalc/Range.java
index 17e9319..3773fc5 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Range.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Range.java
@@ -18,44 +18,49 @@ class Range implements Iterable<Address>
   private final List<Address> range = new ArrayList<Address> ();
   private final Sheet parent;
 
-  public Range (Sheet parent, String rangeText)
+  private boolean isHorizontal;
+
+  public Range (Sheet parent, Cell cell, String rangeText)
   {
     this.parent = parent;
-    setRange (rangeText);
 
-    createCells ();
+    Matcher m = rangePattern.matcher (rangeText);
+    if (m.find ())
+    {
+      from = new Address (m.group (1), m.group (2));
+      to = new Address (m.group (3), m.group (4));
+      isHorizontal = from.rowMatches (to);
+      populateRange ();
+    }
+    else
+      throw new IllegalArgumentException ();
+
   }
 
   public Range (Sheet parent, Address from, Address to)
   {
+    this.parent = parent;
     this.from = from;
     this.to = to;
-    this.parent = parent;
 
-    addRange ();
-
-    createCells ();
+    isHorizontal = from.rowMatches (to);
+    populateRange ();
   }
 
-  public Range (Sheet parent, String[] cells)
-  {
-    this.parent = parent;
+  //  public Range (Sheet parent, String[] cells)
+  //  {
+  //    this.parent = parent;
+  //
+  //    for (String s : cells)
+  //      range.add (new Address (s));
+  //
+  //    createCells ();
+  //  }
 
-    for (String s : cells)
-      range.add (new Address (s));
-
-    createCells ();
-  }
-
-  private void createCells ()
-  {
-    for (Address address : range)
-      parent.getCell (address);
-  }
-
-  private void addRange ()
+  private void populateRange ()
   {
     range.add (from);
+    parent.getCell (from);
     Address tempFrom = from;
 
     if (from.rowMatches (to))
@@ -63,31 +68,43 @@ class Range implements Iterable<Address>
       {
         from = from.nextColumn ();
         range.add (from);
+        parent.getCell (from);
       }
     else if (from.columnMatches (to))
       while (from.compareTo (to) < 0)
       {
         from = from.nextRow ();
         range.add (from);
+        parent.getCell (from);
       }
     else
       throw new InvalidParameterException ();
 
     from = tempFrom;
+
+    //    createCells ();
   }
 
+  //  private void createCells ()
+  //  {
+  //    for (Address address : range)
+  //      parent.getCell (address);         // ensure that the cell exists
+  //  }
+
   boolean isHorizontal ()
   {
-    Address first = range.get (0);
-    Address last = range.get (range.size () - 1);
-    return first.rowMatches (last);
+    //    Address first = range.get (0);
+    //    Address last = range.get (range.size () - 1);
+    //    return first.rowMatches (last);
+    return isHorizontal;
   }
 
   boolean isVertical ()
   {
-    Address first = range.get (0);
-    Address last = range.get (range.size () - 1);
-    return first.columnMatches (last);
+    //    Address first = range.get (0);
+    //    Address last = range.get (range.size () - 1);
+    //    return first.columnMatches (last);
+    return !isHorizontal;
   }
 
   @Override
@@ -98,59 +115,59 @@ class Range implements Iterable<Address>
 
   public int size ()
   {
-    int total = 0;
+    //    int total = 0;
+    //
+    //    for (Address address : range)
+    //      if (parent.getCell (address) != null)
+    //        ++total;
 
-    for (Address address : range)
-      if (parent.getCell (address) != null)
-        ++total;
-
-    return total;
+    return range.size ();
   }
 
-  private void setRange (String text)
-  {
-    Matcher m = rangePattern.matcher (text);
-    if (m.find ())
-    {
-      from = new Address (m.group (1), m.group (2));
-      to = new Address (m.group (3), m.group (4));
-      addRange ();
-      return;
-    }
-
-    m = addressList.matcher (text);
-    if (m.find ())
-    {
-      System.out.printf ("Address list: %s%n", text);
-      String[] cells = m.group (1).split (",");
-      for (String s : cells)
-      {
-        System.out.println (s);
-        if (cellAddress.matcher (s).matches ())
-          range.add (new Address (s));
-        else
-        {
-          System.out.println ("Not a cell address: " + s);
-        }
-      }
-
-      System.out.println ();
-      return;
-    }
-
-    int pos = text.indexOf ("...");
-    if (pos > 0)
-    {
-      String fromAddress = text.substring (0, pos);
-      String toAddress = text.substring (pos + 3);
-      from = new Address (fromAddress);
-      to = new Address (toAddress);
-      addRange ();
-      return;
-    }
-
-    System.out.printf ("null range [%s]%n", text);
-  }
+  //  private void setRange (String text)
+  //  {
+  //    Matcher m = rangePattern.matcher (text);
+  //    if (m.find ())
+  //    {
+  //      from = new Address (m.group (1), m.group (2));
+  //      to = new Address (m.group (3), m.group (4));
+  //      populateRange ();
+  //      return;
+  //    }
+  //
+  //    //    m = addressList.matcher (text);
+  //    //    if (m.find ())
+  //    //    {
+  //    //      System.out.printf ("Address list: %s%n", text);
+  //    //      String[] cells = m.group (1).split (",");
+  //    //      for (String s : cells)
+  //    //      {
+  //    //        System.out.println (s);
+  //    //        if (cellAddress.matcher (s).matches ())
+  //    //          range.add (new Address (s));
+  //    //        else
+  //    //        {
+  //    //          System.out.println ("Not a cell address: " + s);
+  //    //        }
+  //    //      }
+  //    //
+  //    //      System.out.println ();
+  //    //      return;
+  //    //    }
+  //
+  //    int pos = text.indexOf ("...");
+  //    if (pos > 0)
+  //    {
+  //      String fromAddress = text.substring (0, pos);
+  //      String toAddress = text.substring (pos + 3);
+  //      from = new Address (fromAddress);
+  //      to = new Address (toAddress);
+  //      populateRange ();
+  //      return;
+  //    }
+  //
+  //    System.out.printf ("null range [%s]%n", text);
+  //  }
 
   @Override
   public String toString ()
diff --git a/src/com/bytezone/diskbrowser/visicalc/Sheet.java b/src/com/bytezone/diskbrowser/visicalc/Sheet.java
index 22771f3..be4b861 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Sheet.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Sheet.java
@@ -363,7 +363,7 @@ public class Sheet
       if (columnWidths.containsKey (column))
         width = columnWidths.get (column);
 
-      char letter1 = column < 26 ? ' ' : column < 52 ? 'A' : 'B';
+      char letter1 = column < 26 ? '-' : column < 52 ? 'A' : 'B';
       char letter2 = (char) ((column % 26) + 'A');
 
       if (width == 1)
diff --git a/src/com/bytezone/diskbrowser/visicalc/Sum.java b/src/com/bytezone/diskbrowser/visicalc/Sum.java
index 5fa74ef..d8415b3 100644
--- a/src/com/bytezone/diskbrowser/visicalc/Sum.java
+++ b/src/com/bytezone/diskbrowser/visicalc/Sum.java
@@ -2,13 +2,13 @@ package com.bytezone.diskbrowser.visicalc;
 
 class Sum extends Function
 {
-  private final Range range;
+  private final ExpressionList list;
 
   public Sum (Sheet parent, Cell cell, String text)
   {
     super (parent, cell, text);
 
-    range = new Range (parent, text);
+    list = new ExpressionList (parent, cell, functionText);
   }
 
   @Override
@@ -17,20 +17,20 @@ class Sum extends Function
     value = 0;
     valueType = ValueType.VALUE;
 
-    for (Address address : range)
+    for (Value v : list)
     {
-      Cell cell = parent.getCell (address);
+      v.calculate ();
 
-      if (cell.isValueType (ValueType.NA))
+      if (v.isValueType (ValueType.NA))
         continue;
 
-      if (!cell.isValueType (ValueType.VALUE))
+      if (!v.isValueType (ValueType.VALUE))
       {
-        valueType = cell.getValueType ();
+        valueType = v.getValueType ();
         break;
       }
 
-      value += cell.getValue ();
+      value += v.getValue ();
     }
   }
 }
\ No newline at end of file