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C is the letter that is sometimes mistakenly used in place of an X at the end of a text message . This has become increasingly common since the majority of phone keyboards are of the QWERTY format. If a message that ends in a C instead of an X is not followed up immediately whit a message that says simply 'X', it suggests that the the original mistake was not noticed by the other party when they did their ISTRB (Immediate Sent Text Read Back). C is also for Cookie, that's good enough for me.
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