RosettaCodeData/Task/Identity-matrix/K/identity-matrix.k

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=4
(1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1)
=5
(1 0 0 0 0
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1)