--- a/Implab/Parsing/EnumAlphabet.cs	Tue Jun 17 19:40:43 2014 +0400
+++ b/Implab/Parsing/EnumAlphabet.cs	Wed Jun 18 03:54:02 2014 +0400
@@ -1,6 +1,7 @@
 using Implab;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Globalization;
 using System.Linq;
 using System.Text;
@@ -45,11 +46,12 @@
 
 
         public EnumAlphabet()
-            : base() {
+            : base(_symbols.Length) {
         }
 
         public EnumAlphabet(int[] map)
             : base(map) {
+            Debug.Assert(map.Length == _symbols.Length);
         }
 
 
@@ -61,8 +63,5 @@
             get { return _symbols; }
         }
 
-        protected override int MapSize {
-            get { return _symbols.Length; }
-        }
     }
 }