# Intersection is an internal point:
intersect 0 1 1 0 0 1
intersect 1 0 1 0 0 1
# Intersection is an end point:
intersect 0 2 1 0 1 1
intersect 2 0 1 0 1 1
# Intersection is an x-monotone curve:
intersect 2 3 1 1 4
intersect 3 2 1 1 4
# Intersection is an x-monotone curve stricktly contained in an input curve: 
intersect 4 5 1 1 4
intersect 5 4 1 1 4
