Hi Could you tell me where I can find the actual code of such key functions in perl in the src distribution? Thanks, Jong -- ... Science is not a craftsmanship nor a simple clever discovery of nature. It is not a task for any clever mind with a good memory and a good understanding on the techniques involved with a good class mark from previous schools. It requires a maturity as an educated human personality with proper insights on the processes and consequences of the work involved to the society and all humanbeings in the far extent. It is a scholastic activity with unselfish and unbiased causes..