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2d Arrays Combination

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I have this problem, given N arrays I have to get the possible combinations of this arrays in an example like this:

String[] array1 = {1,2,3};
String[] array2 = {A,B,C};
String[] array3 = {$,&,%};

Will result in an array or vector like this:

String[] resultsArray = {1,2,3,A,B,C,$,&,%,1A,1B,1C, 2A, 2B, 2C, 3A, 3B, 3C, 1A$, etc}

I understand that I have to make a recursive call to a method but I'm kind of stuck here, any help we'll be welcome:

I have tried to solve this problem like this:

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