That is because you overwrite the file each time you open it. Try appending instead:

open OUT, ">>results5";
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Also, consider checking the results from open and responding accordingly to errors:

open OUT, ">>results5" or die "Cannot write to output: $!\n";
[download]

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)