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Many thanks Don !! This certainly is more complex than what I was trying to do - but it does the job perfectly.

Thanks again!!

Hi Don, thanks for taking the time. Below, are the answers to your questions:

1. Do you want input fields 2 and 4 to be removed from every input line?
Yes - they need to be removed

2. If the...

I have an input file that looks like:

ID1 V1 ID2 V2 P1 P2 P3 P4 ..... n no. of columns
1 1 1 1 1.0000 1.0000 1.0000 1.0000
1 1 1 2 0.9999 0.8888 0.7777 0.6666
1 2 1 1 0.8888 0.7777 0.6666...