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Let \( \mathrm{M} \) and \( \mathrm{N} \) be two \( 3 \times 3 \) non-singular skewsymmetric matrices such that \( \mathrm{MN}=\mathrm{NM} \). If \( \mathrm{P}^{\mathrm{T}} \) denotes the transpose of \( \mathrm{P} \), then \( \mathrm{M}^{2} \mathrm{~N}^{2}\left(\mathrm{M}^{\mathrm{T}} \mathrm{N}\right)^{-1} \) \( \left(\mathrm{MN}^{-1}\right)^{\mathrm{T}} \) is equal to
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