Is there any word processor specific for Ipad 2 application?

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So, there are might be different formats of word processors for different operating systems. I just wonder if there is any word processor apps existed specific for Ipad 2 device? I have an Ipad 2 myself, except browsing the world wide web, or play games, or do some trick with those funky apps from Itune, I also want to do some documentation, so I might need word processor. Does anyone here know what kind of word processor apps I can download from Itune?