( [ x, x, x, x, x],
  [ x, y, y, y, x],
  [ x, y, z, y, x],
  [ x, y, y, y, x],
  [ x, x, x, x, x],
)

##</code><code>##

( [ 1,  2,  3,  4,],
  [ 5,  6,  7,  8,],
  [ 9, 10, 11, 12,],
  [13, 14,  3, 16,],
  [ 2, 18, 19, 20,] )