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In page Canonical LR parser:

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However, a new type of LR(1) parser, some people call a "Minimal LR(1) parser" was introduced in 1977 by David Pager[3] who showed that LR(1) parsers can be created whose memory requirements rival those of LALR(1) parsers. Recently, some parser generators are offering Minimal LR(1) parsers, which not only solve the memory requirement problem, but also the mysterious-conflict-problem inherent in LALR(1) parser generators.[citation needed] In addition, Minimal LR(1) parsers can use shift-reduce actions, which makes them faster than Canonical LR(1) parsers.