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1 3 4 8 - BAD (3,4,5)
1 4 7 8 - BAD (7 + 8 = 15)
...
3 6 8 9 - BAD (9 + 6 = 15)
4 7 8 9 - BAD (7 + 8 = 15)
6 7 8 9 - BAD (9 + 6 = 15)

#!/usr/bin/perl
use strict;
...
    }
    return 0;
}