A = [[1,  0,  1,  3],
     [5, -3, .5,  0],
     [2, -1,  0, -2],
     [4,  3, 11, -7]]

# det(A) = -73.5

B = [[-7,   1,  -2, -7, -7],
     [-10, -9,  -2, -8,  6],
     [-5,   4,   1,  0,  9],
     [0,   -9, -10,  7, -5],
     [-3,  -7,   9, -2, -1]]

# det(B) = -185740

C = [[-3, -4, 10, -4, -9, -5, -5, -5, 2, -6],
     [-8, -8, -6, -3, 1, -8, 9, -4, -3, 5],
     [8, -7, 5, -5, -7, 9, 0, -4, -1, 0],
     [-10, -8, 5, -1, 5, 5, -1, 3, 9, -3],
     [0, -10, -9, -4, -7, 4, -7, -8, 5, -7],
     [-1, 10, 1, 0, 10, 1, -10, -4, 3, 6],
     [2, 3, 9, 2, 9, 0, -4, 4, 9, -6],
     [5, -10, -5, -5, 9, -3, 4, -7, 3, -10],
     [-6, -5, 0, -5, -8, 8, 2, -9, 3, 8],
     [0, -2, 9, -7, 9, 6, 7, 2, 5, -3]]

# det(C) = 57939126536 (takes a couple of seconds)

D = [[-7,   1,  -2, -7, -7],
     [-10, -9,  -2, -8,  6],
     [-5,   4,   1,  0,  9],
     [0,   -9, -10,  7, -5],
     [-10, -9,  -2, -8,  6]]

# det(D) = 0 # 2nd and 5th row are identical