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Update 2.2.md #159

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3 changes: 3 additions & 0 deletions ch02/2.2/2.2.md
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Expand Up @@ -137,6 +137,9 @@ the following languages. In each case show that your grammar is correct.
10101 is 3*7, hence, k = 7 = 111 in binary. Because 111 has more than 2
consecutive 1's in binary, the grammar will never produce 21.

**Another proof**:

Notice that every number generated by this grammar has a even number of 1, while 10101 has an odd number of 1. It can't be generated by this grammar.

### 2.2.6

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