Ignore pieces with only one state during solving. #1323
Merged
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Straight up dumb off-by-one error. 🙃
This should make the solver a little faster (though it mostly uses the piece state map to look up states, so the shorter piece list won't have a huge effect).
The biggest practical effect is that the debug output of the solver is a lot easier to read because it isn't cluttered up by pointless pieces that it isn't solving for.