Context-Free Grammar (CFG) Example: Equal Pairs
Here we make a context-free grammar (CFG) for the language of all strings of the form 0^n 1^n 2^m 3^m, where n, m are at least 0. Note that we have essentially the same problem twice, and both problems are adjacent to each other. Since m and n are independent of each other, we can just make a small CFG for each, and then put them together with concatenation.
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