data types list of lists

hello, I need to create a 3x3 list how can I do?

This is relatively straightforward, all you need to do is create a list that contains three lists of three elements each. If you can give us more details about the exact format of the data you are representing we might be able to give more targeted advice.

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see here http://www.appinventor.org/content/CourseInABox/quizApps/listPicker