If bar(a) = bar(i) - 2bar(j) - 3bar(k), ...

If `bar(a) = bar(i) - 2bar(j) - 3bar(k), bar(b) = 3bar(i) -bar(j)+2bar(k)` then S.T `bar(a)+bar(b).bar(a)-bar(b)` are perpendicular.

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