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accepts two x-monotone curves xc1 and xc2 and determines
whether they can be merged to form a single x-monotone curve.
xc1 and xc2 are mergeable if their underlying curves are
identical, they share a common endpoint, and they do not bend to form
a non-x-monotone curve.
| Precondition: | The target point of xc1 and the source point xc2
coincide or the source point of xc2 and the target
point xc2 coincide. |
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