| http://www.w3.org/ns/prov#value | - From the tangent lines, a series of circles is derived (the number of circles that can be derived equals n!/(3!*(n???3)!) or nC3 where n is the number of lines or points, e.g. for 1 line, 0 circles; for 2 lines, 0 circles; for 3 lines, 1 circle; for 4 lines, 4 circles; for 5 lines, 10 circles . . . ).
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