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

If `bar(a)=bar(i)-2bar(j)+bar(k), bar(b)=2bar(i)+bar(j)+bar(k), bar(c ) = bar(i) + 2bar(j)-bar(k)`, then find `bar(a) xx (bar(b) xx bar(c ))` and `|(bar(a)xxbar(b))xxbar(c )|`.

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