12 of then but if they are joined together in the form of a 6 sided hexagon then 6 endpoints are needed.
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No. They have 2.
You need any number between 10 to 20 distinct end points.
There are 28 lines segments that both have their endpoints located at the vertices of a given cube.
what of a triangle has three line segments that intersect only at their endpoints
8 remember OCTOpus OCTO gone