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6.12.3 The Lexicon File

A lexicon file has the suffix .lex. It consists of any number of values and constant definitions, each terminated by a semicolon. Each value stands for a lexical entry. A value may contain named constants and the operators ., +, -, *, and /. values, the lexical entries; The format of the lexical entries is free, although it should be consistent with the conception of the whole rule system.