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Using Three20 Library

Hello, I'm a baby ipad developer I want to use three20 library in my project and I add this library correctly to my project but when I used it, I got a lot of errors fro example when I add " #import "extThree20JSON/extThree20JSON.h" to my project , xcode said:I don't know any classes or ... with this name I know I forgot to do something ridicules but I can't find please help me Thanks

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