Slight solver speedup by tracking more carefully which block merges
authorsimon <simon@cda61777-01e9-0310-a592-d414129be87e>
Mon, 7 May 2007 17:51:37 +0000 (17:51 +0000)
committersimon <simon@cda61777-01e9-0310-a592-d414129be87e>
Mon, 7 May 2007 17:51:37 +0000 (17:51 +0000)
we've already tried, and not trying them again.

git-svn-id: svn://svn.tartarus.org/sgt/puzzles@7553 cda61777-01e9-0310-a592-d414129be87e


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