We regard two grids as inequivalent if one cannot be transformed into another by some sequence of symmetries, or by relabeling. For the 2 X 3 Sudoku grids case the allowed equivalences are (see link to Jarvis):
- relabeling entries; reflection; rotation;
- permutation of blocks of columns 1-2, 3-4 and 5-6;
- permutation of blocks of rows 1-3 and 4-6;
- permutation of columns 1-2;
- permutation of columns 3-4;
- permutation of columns 5-6;
- permutation of rows 1-3;
- permutation of rows 4-6.
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