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Let $P$ be a set of $n$ points in general position in the plane. Let $R$ be aset of $n$ points disjoint from $P$ such that for every $x,y \in P$ the linethrough $x$ and $y$ contains a point in $R$ outside of the segment delimited by$x$ and $y$. We show that $P \cup R$ must be contained in a cubic curve.

On sets of $n$ points in general position that determine lines that can be pierced by $n$ points