How to edit autocorrect dictionary

ok, have iphone 4 ios 5.1 - restored factory , dictionary reset... , still autocorrects "if" "of" (and vice versa), "so" <--> "do".

can please tell me file on iphone causing happen? want modify it. have ifile installed , ready go, having trouble determining in order fix it. 90% of time when autocorrects words, incorrectly.

can't believe such simple bug still isn't fixed, latest ios release.

 

why not reset keyboard's dictionary?

 

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