A model fo of this type must provide:
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Constructs the line segment supported by l, whose source
is p1 and whose target is p2.
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Constructs the line segment whose supporting line is l, whose
source endpoint is the intersection of l with c1,
and whose target endpoint is the intersection of l
and c2, where intersections are ordered lexicographically.
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Same, for intersections defined by lines instead of circles. |