1diff --git a/src/Parser/Parser.ts b/src/Parser/Parser.ts
 2index 4e06cfb..4c0d2bc 100644
 3--- a/src/Parser/Parser.ts
 4+++ b/src/Parser/Parser.ts
 5@@ -358,6 +358,17 @@ let Parser = (function () {
 6           action = ACTION_TABLE[state] && ACTION_TABLE[state][symbol];
 7         }
 8 
 9+        console.log({
10+          text: lexer.match,
11+          token: SYMBOL_INDEX_TO_NAME[symbol] || symbol,
12+          tokenIndex: symbol,
13+          line: lexer.yylineno,
14+          loc: yyloc,
15+          state: state,
16+          stack: stack,
17+          semanticValueStack: semanticValueStack
18+        });
19+
20         // handle parse error
21         if (typeof action === 'undefined' || !action.length || !action[0]) {
22           let error_rule_depth;
23diff --git a/src/Parser/ParserConstants.ts b/src/Parser/ParserConstants.ts
24index e39232d..da018a5 100644
25--- a/src/Parser/ParserConstants.ts
26+++ b/src/Parser/ParserConstants.ts
27@@ -360,7 +360,9 @@ const SYMBOL_INDEX_TO_NAME = symbolIndexToName;
28 
29 const enum State {
30   START = 0,
31-  START_NUMBER = 6
32+  START_NUMBER = 6,
33+  ADD_TWO_NUMBERS = 45,
34+  SUBTRACT_TWO_NUMBERS = 52
35 }
36 
37 
38@@ -420,7 +422,7 @@ table[3] = ObjectBuilder
39   .add(Symbol.CARROT, [REDUCE, ReduceActions.CALL_VARIABLE])
40   .add(Symbol.SEMI_COLON, [REDUCE, ReduceActions.CALL_VARIABLE])
41   .add(Symbol.COMMA, [REDUCE, ReduceActions.CALL_VARIABLE])
42-  .add(33, [SHIFT, ReduceActions.CELL_VALUE])
43+  .add(Symbol.DECIMAL, [SHIFT, ReduceActions.CELL_VALUE])
44   .build();
45 table[State.START_NUMBER] = ObjectBuilder
46   .add(Symbol.EOF, [REDUCE, ReduceActions.AS_NUMBER])
47@@ -731,7 +733,7 @@ table[25] = ObjectBuilder
48   .build();
49 table[26] = ObjectBuilder
50   .add(Symbol.ERROR, 13)
51-  .add(Symbol.EXPRESSION, 52)
52+  .add(Symbol.EXPRESSION, State.SUBTRACT_TWO_NUMBERS)
53   .add(Symbol.VARIABLE_SEQUENCE, 3)
54   .add(Symbol.NUMBER, State.START_NUMBER)
55   .add(Symbol.STRING, [SHIFT, 7])
56@@ -949,7 +951,7 @@ table[44] = ObjectBuilder
57   .add(Symbol.SEMI_COLON, [REDUCE, ReduceActions.EQUALS])
58   .add(Symbol.COMMA, [REDUCE, ReduceActions.EQUALS])
59   .build();
60-table[45] = ObjectBuilder
61+table[State.ADD_TWO_NUMBERS] = ObjectBuilder
62   .add(Symbol.EOF, [REDUCE, ReduceActions.PLUS])
63   .add(Symbol.AMPERSAND, [SHIFT, 20])
64   .add(Symbol.EQUALS, [REDUCE, ReduceActions.PLUS])
65@@ -1064,7 +1066,7 @@ table[51] = ObjectBuilder
66   .add(Symbol.SEMI_COLON, [REDUCE, ReduceActions.NOT])
67   .add(Symbol.COMMA, [REDUCE, ReduceActions.NOT])
68   .build();
69-table[52] = ObjectBuilder
70+table[State.SUBTRACT_TWO_NUMBERS] = ObjectBuilder
71   .add(Symbol.EOF, [REDUCE, ReduceActions.MINUS])
72   .add(Symbol.AMPERSAND, [SHIFT, ReduceActions.TO_POWER])
73   .add(Symbol.EQUALS, [REDUCE, ReduceActions.MINUS])