[net.micro] uiucdcs.2270: Re: Spelling and u

kline@uiucuxc.UUCP (06/23/83)

#R:tucc:-377200:uiucuxc:3700056:000:104
uiucuxc!kline    Jun 23 00:53:00 1983

Those are called 'typos' and you can usually tell them apart because they
occur only once in a message.