2. The method of claim 1 wherein each grammar rule of the set of grammar rules comprises a context-free grammar rule.
2. The method of claim 1 wherein each grammar rule of the set of grammar rules comprises a context-free grammar rule. 3. The method of claim 2 wherein each context-free grammar rule is a 4-tuple that consists of a start point, a non-terminal element, a terminal element, and a rule.