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+kelbt (Backtracking LR Parsing)
+
+Kelbt generates backtracking LALR(1) parsers. Where traditional
+LALR(1) parser generators require static resolution of shift/reduce
+conflicts, Kelbt generates parsers that handle conflicts by
+backtracking at runtime. Kelbt is able to generate a parser for any
+context-free grammar that is free of hidden left recursion.