I recommed you do what PrakashK offered for you. He is absolutely correct in his method, and i think you should really study that. The snippet that i gave you is unfortunately not very practical, i just wanted to demonstrate how to iterate through an array.

jeffa

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)