make_x_monotone 0 1 1 0
make_x_monotone 7 1 1 0
#
make_x_monotone 1 2 1 1 1 2
make_x_monotone 8 2 1 2 1 1
#
make_x_monotone 2 3 1 0 1 3 1 4
make_x_monotone 9 3 1 4 1 3 1 0
#
make_x_monotone 3 2 1 5 1 6
make_x_monotone 10 2 1 6 1 5
#
make_x_monotone 4 3 1 7 1 8 1 9
make_x_monotone 11 3 1 9 1 8 1 7
#
make_x_monotone 5 1 1 10
make_x_monotone 12 1 1 10
#
make_x_monotone 6 9 1 11 1 12 1 13 1 14 1 15 1 16 1 17 1 18 1 19
make_x_monotone 13 9 1 19 1 18 1 17 1 16 1 15 1 14 1 13 1 12 1 11
