Hi Choroba,

Thank you very much for fixing the problem and providing me valuable suggestions regarding unique (array) and whitespace. I shall follow your suggestions. I searched in google for fixing this problem using perl code but I didn't get any such information. But I found a script based on Java program which I do not know. The URL for java solution is http://seqanswers.com/forums/showthread.php?t=4442

So, I wrote to perl monks for help.

With regards