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use v5.10;
use strict;
...
           (*FAIL)
         /x;

$ ./oldestplayspiano.pl
SOL             NUMBER
...
(18, 4, 1)       23
(12, 6, 1)       19
(9, 8, 1)        18

           x*y*z = 72
           x+y+z = number on that building over there...

             (8, 3, 3)
             (6, 6, 2)