Exercise ‹4›:

Lexical ANTLR description for all strings of lowercase letters where the letters appear in strict lexicographic increasing order (a<b<c<…<m<n<o<…a<b<c<\ldots<m<n<o<\ldots)
For example, bcfbcf is in the language, but baba and cccc are not.
Authors: Guillem Godoy (taken from Jordi Cortadella's exercise list) / Documentation:
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