=OR(INDIRECT("I"&ROW())={"A","T","AC","AB"})

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HTH

Bob

"Ken" wrote in message
...

Hi Fred,
I tried as you suggested and came up with the following:

=AND(INDIRECT("I"&ROW())="A"),INDIRECT("I"&ROW())= "T"),INDIRECT("I"&ROW
())="AC"),INDIRECT("I"&ROW())="AB"))

It gives me an error message that something is wrong with the
formula....have I missed something?
Thanks for your help!
Ken