From card no. 3PVO9N9C:

ah a matrix indeed Interesting I either don't remember it being referres d to it as a Latin square, at least its tyoe p ... But you jnow k what they say about Euler.
ah a matrix indeed Interesting I either don't remember it being referres d to it as a Latin square, at least its tyoe p ... But you jnow k what they say about Euler. Yes, a Matrix...