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`bar(a) , bar(b), bar (c )`, are non-coplanar vectors, Prove that the following four points are coplanar.
`6bar(a) + 2bar(b) - bar(c ), 2bar(a) - bar(b) + 3bar(c ), -bar(a) + 2bar(b)-4bar(c ), -12bar(a)-bar(b)-3bar(c )`.

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