TESTS FAIL. No longer return only one step for a given candidate (this makes it easier to see what cells would be returned, which is otherwise hard given non-deterministic order of iterating over keys in a map)
TESTS FAIL. No longer return only one step for a given candidate (this makes it easier to see what cells would be returned, which is otherwise hard given non-deterministic order of iterating over keys in a map)

jkomoros/sudoku,jkomoros/sudoku,jkomoros/sudoku