> -Wbrown # line 1
-5 1  # x11 y11
5 1   # x12 y12
> -Wblue # line 2
-5 0  # x21 y21
5 0   # x22 y22
> -Wred  # line 3
-5 2  # x31 y31
5 2   # x32 y32