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(ritem_longest_rhs): Use it. * src/gram.h (rule_t): `number' is a new member. * src/reader.c (packgram): Set it. * src/reduce.c (reduce_grammar_tables): Move the useless rules at the end of `rules', and count them out of `nrules'. (reduce_output, dump_grammar): Adjust. * src/print.c (print_grammar): It is no longer needed to check for the usefulness of a rule, as useless rules are beyond `nrules + 1'. * tests/reduce.at (Reduced Automaton): New test.