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Prove that [veclvecmvecn][vecavecbvecc]=...

Prove that `[veclvecmvecn][vecavecbvecc]=|{:(vecl*veca,vecl*vecb,vecl*vecc),(vecm*veca,vecm*vecb,vecm*vecc),(vecn*veca,vecn*vecb,vecn*vecc):}|`

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