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`bar(a)`,`bar(b)` and `bar(c)` are three vectors such that `bar(a)`+`bar(b)`+`bar(c)`=`bar(0)` and `|bar(a)|`=2,`|bar(b)|`=3,`|bar(c)|`=5 ,then `bar(a)`.`bar(b)`+`bar(b)`.`bar(c)`+`bar(c)` .`bar(a)` equals

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