>Well, ASC("C") returns 67 and ASC("T") returns 84. I must admit I have no idea why I was thinking that way. Between "C" and "T" is just as good. There are times when using the ascii numbers is more convenient.
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Charlie:

Thank you. So this will check for the occrrences of any letters that are between C and T - then flag a .T. if it is true and an .F. if its outside of the specified range?

Thanks.