puzzleA.m
33bba04159d6master

puzzleA.m
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			function A = puzzleA()
			T = diag(ones(N-1,1), -1) + diag(ones(N,1), 0) + diag(ones(N-1,1), 1);
			I = eye(N);
			A = kron(T, I) + kron(I, T) - kron(I, I);
			end