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\begin{ccRefFunction}{coplanar}
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\ccInclude{CGAL/predicates_on_points_3.h}
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\ccFunction{bool coplanar(const Point_3<R> &p,
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const Point_3<R>&q,
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const Point_3<R>&r,
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const Point_3<R>&s);}
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{returns \ccStyle{true}, if $p$, $q$, $r$, and $s$ are coplanar.}
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\end{ccRefFunction}
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