look at this picture which is more clear(http://
grasshopper3d.googlegroups.com/web/Snap60%E5%89%AF%E6%9C%AC.jpg?
hl=en&gda=VtqwOE4AAAC19Ve3i4OoV9kZmG4Q4mscNIkyP-
tCUghW1QuVVlVA61YqcskqebAbKftsofvUXEUn7qXJT5AHaveIBVLZAuxz47Cl1bPl-23V2XOW7kn5sQ&gsc=qfXejhYAAADUzyauo2L8w-
tO_BGKbWcFaKk2tFLs90LD5qOQGCC3Kw)

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