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show that |{:(3a,,-a+b,,-a+c),(-b+a ,,3b...

show that `|{:(3a,,-a+b,,-a+c),(-b+a ,,3b,,-b+c),( -c+a,, -c+b,,3c):}|`
`= 3(a+b+c) (ab+ bc+ca)`

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