For example if the function get this array of strings {A,B,C} it will return array of those items:
{"","A","B","C","AB","AC","BC","ABC"}
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did you try anything so far ? please show some effort or some code – vlatkozelka Dec 21 '14 at 23:23
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And some helpful implementation can be found [here](http://stackoverflow.com/questions/20906214/permutation-algorithm-for-array-of-integers-in-java) – wassgren Dec 21 '14 at 23:23
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Duplicate of http://stackoverflow.com/questions/21620006/need-to-generate-superset-in-java – rp.beltran Dec 21 '14 at 23:24
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2This is a [power set](https://en.wikipedia.org/wiki/Power_set), not a "group of groups". – khelwood Dec 21 '14 at 23:24
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Thanks Mike Kobit, yes that what i was looking for, I didnt know how to search for it... – Yuval Levy Dec 21 '14 at 23:24