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a = 1; b = 5; c = 12; (* version 10 *) StringTemplate["`1`-`2`-`3`.mx"][a, b, c] (* "1-5-12.mx" *) (* 10 and lower *) StringJoin @@ Riffle[ToString /@ {a, b, c}, "-"] <> ".mx" (* "1-5-12.mx" *)



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