A Square Constructed

The Prompt

Choose one: (a) construct a Sudoku puzzle with a unique solution and demonstrate its uniqueness; or (b) construct a Greco-Latin square of order 10 — an order Euler conjectured impossible and which Bose, Shrikhande, and Parker disproved in 1959. Note the method.

Completion Criteria

The grid, a note on the construction method, and (for a Sudoku) a sketch of the uniqueness argument or (for a Greco-Latin square) the citation that grounds the construction.

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