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This is preparing to separate out the auxiliary functionality, and perhaps leave space for making more of it in future. The previous name 'edsf' was too vague: the 'e' stood for 'extended', and didn't say anything about _how_ it was extended. It's now called a 'flip dsf', since it tracks whether elements in the same class are flipped relative to each other. More importantly, clients that are going to use the flip tracking must say so when they allocate the dsf. And Keen's need to track the minimal element of an equivalence class is going to become a non-default feature, so there needs to be a new kind of dsf that specially tracks those, and Keen will have to call it. While I'm here, I've renamed the three dsf creation functions so that they start with 'dsf_' like all the rest of the dsf API.
This subdirectory contains puzzle implementations which are half-written, fundamentally flawed, or in other ways unready to be shipped as part of the polished Puzzles collection. The CMake build system will _build_ all of the source in this directory (to ensure it hasn't become unbuildable), but they won't be included in all-in-one puzzle binaries or installed by 'make install' targets. If you want to temporarily change that, you can reconfigure your build by defining the CMake variable PUZZLES_ENABLE_UNFINISHED. For example, cmake . -DPUZZLES_ENABLE_UNFINISHED="group;slide" will build as if both Group and Slide were fully official puzzles.