I am sorry... the exact sage-input should of course spell like this:
---- snip ----
L = LatinSquare(Matrix([[-1, -1, -1, 6, -1, 0, -1, -1, 9, -1, -1, 8,
11, -1, 4, -1],
[-1, 8, 4, -1, 15, 10, 0, -1, 2, -1, 6, -1, -1, -1, 3, -1],
[-1, -1, 8, -1, -1, 14, 3, 6, -1, -1, 4, 10, 5, 9, 15, -1],
[-1, -1, -1, -1, 13, -1, 8, 11, 15, -1, 7, -1, -1, -1, -1, 2],
[11, -1, 6, -1, 10, 5, -1, 8, -1, -1, 3, -1, 4, -1, -1, 7],
[-1, -1, -1, 11, 14, 8, -1, -1, 5, 7, 10, -1, 2, -1, -1, -1],
[15, -1, 10, -1, -1, -1, 4, -1, -1, -1, -1, 11, -1, 3, -1, -1],
[-1, -1, -1, -1, -1, -1, -1, 5, -1, 2, 12, 0, 7, 10, 11, 14],
[-1, 2, 3, -1, -1, 13, -1, 12, -1, 1, 14, 15, 0, -1, 8, 9],
[ 3, 5, -1, 4, 11, 12, 10, 1, 0, 14, -1, 13, 9, -1, -1, 6],
[ 7, -1, -1, -1, 9, -1, -1, -1, 10, -1, -1, -1, -1, -1, 0, 5],
[ 9, 10, -1, -1, 2, -1, -1, -1, 14, -1, 0, -1, -1, 5, -1, 4],
[-1, -1, -1, -1, -1, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, 12],
[14, 4, 12, 15, -1, -1, -1, 2, -1, -1, -1, -1, 13, -1, -1, -1],
[-1, -1, -1, -1, 6, -1, -1, 9, -1, 0, 8, 4, 14, -1, 10, -1],
[-1, 0, 13, 8, -1, 3, -1, 14, 11, 10, -1, 2, 15, -1, 1, -1]]))
L.is_completable()
---- snip ----
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