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...program. But if A could expand to the empty string (called an ε-production), then the parser would recognise a valid empty A, since the next token b is in the follow set of A. The current Python grammar does not contain ε-productions, so the follow sets are not needed when creating the parse tables. Currently, in CPython, a parser generator program reads the grammar and produces a parsing table representing a set of deterministic finite automata (DFA) that can be included in a C program, the ...