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@a=qw(1 0 9 15 6);
@b=qw(    1 1  4 );

1 0 9 15 6
     1 1 4
__________+
1 1 1 7 0       (which corresponds to the program logic)

1 0 9 15 6
    1 1 4
__________+
10 9 2 7 0     (which corresponds to the rules of math)

#!/usr/local/bin/perl
use strict;
...
                }
print "@result";