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Am elements si respesented by (A,Z) e.g `NI""_(28)^(60)` can be written as (60,28)
Among the following find the total number of possible isotpic pairs formed by the given atoms (232,84),(228,90),(228,90),(214,82),9218,88_, (216,84),9210,84),(213,84) .

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`{:((232","90),(228","90)implies"pair"),((218","84),(218","88)implies "pair"),((216","84),(210","84),(210","84),(213","84)implies"pairs"(""^(3)C_(2))):}`

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