s 0 0 1 0
s 0 0 0 1
s 1 0 1 1
s 0 1 1 1
p 0 0
s 0.25 0 0.75 0
s 0 0 1 1
s 0.5 0 0.5 2
s -1 0.5 2 0.5
s 3 0.5 -1 0.5