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use strict;
use warnings;
...
}

print "@x\n@y\n@z\n";

0 18 36 0 18 36 0 18 36 0 18 36 0 18 36 0 18 36
0 0 0 18 18 18 36 36 36 0 0 0 18 18 18 36 36 36
20 20 20 20 20 20 20 20 20 25 25 25 25 25 25 25 25 25