Sorry, I'm not sure what you're flagging up. Is it
[ol]
[li]That there are two occurrences of 'C' in file 2 and, if so, why are you only interested in the first 'duplicate'[/li]
[li]That there is a line with two letters in it, i.e. B C? If so is there any significance that the next line has a 'C' as well.[/li]
[/ol]These are different problems with different solutions.
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