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Efficient exact cover solver

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When I set secondary_columns, it can not produce the correct answer. Example is [here](https://github.com/xxzl0130/GFChipToolX/tree/0beeebc6490654f31b8a20dea07ed35337d277c7/GFChipDLX). The problem can be reproduced with input file [M2-6-2.json](https://github.com/xxzl0130/GFChipToolX/blob/0beeebc6490654f31b8a20dea07ed35337d277c7/GFChipDLX/M2-6-2.json), here `"optional": 2` means `secondary_columns=2`. Also you...