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If veca, vecb, vecc are three non-coplan...

If `veca, vecb, vecc` are three non-coplanar vetors represented by non-current edges of a parallelopiped of volume 4 units, then the value of
`(veca+vecb).(vecbxxvecc)+(vecb+vecc).(veccxxveca)+(vecc+veca).(vecaxxvecb)`, is

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