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antlr(1) -ck
ANother Tool for Language Recognition
-ck n  Use  up  to  n  symbols of lookahead when using compressed (linear approximation) lookahead.  This
       type of lookahead is very cheap to compute and is attempted before full LL(k) lookahead, which  is
       of  exponential  complexity  in  the worst case.  In general, the compressed lookahead can be much
       deeper (e.g, -ck 10) than the full lookahead (which usually must be less than 4).

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