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computes the intersections of xc1 and xc2 and
inserts them in an ascending lexicographic xy-order into the
output iterator oi. The value-type of Output_iterator is
CGAL::Object, where each Object wraps either a
pair<ArrDirectionalTraits::Point_2, ArrDirectionalTraits::Multiplicity> object, which
represents an intersection point with its multiplicity (in case the
multiplicity is undefined or unknown, it is set to 0) or an
ArrDirectionalTraits::X_monotone_curve_2 object, representing an
overlapping subcurve of xc1 and xc2. In the latter case,
the overlapping subcurves are given the direction of xc1 and
xc2 if their directions are identical. Otherwise, the overlapping
subcurves are given an arbitrary direction. The operator returns a
past-the-end iterator for the output sequence.
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