matrices = [
  ( (1, 2),
    (3, 4)),
  ( (-2, 2, -3),
    (-1, 1,  3),
    ( 2, 0, -1)),
  ( ( 1,  2,  3,  4),
    ( 4,  5,  6,  7),
    ( 7,  8,  9, 10),
    (10, 11, 12, 13)),
  ( ( 0,  1,  2,  3,  4),
    ( 5,  6,  7,  8,  9),
    (10, 11, 12, 13, 14),
    (15, 16, 17, 18, 19),
    (20, 21, 22, 23, 24)) ]

for m <- matrices
  println( m, 'perm: ' + perm(m), 'det: ' + det(m) )