ios - NSArray in NSArray addobject String -

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i know how add object in single array

 [array addobject:@"lastname"]

but have array have 2 more sub-array.i want create third sub-array , add lastname in array how can that
in advance

a litte more detailed:

nsarray *subarray1 = [nsarray arraywithobjects:@"a", @"b", @"c", nil]; nsarray *subarray2 = [nsarray arraywithobjects:@"d", @"e", @"f", nil];  nsmutablearray *mainarray = [nsmutablearray arraywithobjects:subarray1, subarray2, nil];  nsarray *subarray3 = [nsarray arraywithobjects:@"g", @"h", @"i", nil]; [mainarray addobject:subarray3];

good luck ;)


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