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[" (a) "," Firs anfort ",a,c,a+c],[a+b,b...

[" (a) "," Firs anfort ",a,c,a+c],[a+b,b,a,a],[b,b+c,c]|=4abc

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Show that |{:(a,c,a+c),(a+b,b,a),(b,b+c,c):}|=4abc

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