Problem no. 19

Geometry Level pending

An irregular tetrahedron \(ABCD\), if there are point \(K\) in the middle of segment \(AB\), point \(L\) in the middle of segment \(BC\), point \(M\) in the middle of segment \(CD\), and point \(N\) in the middle of segment \(DA\), then \(KLMN\) must be a \(\ldots\)

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