So I just started, and finally earned the gems for the 11 premiums buy
before that, I had cleared up through 6.2

So, that leaves me with 22 cards of 3* or higher, but only 14 different girls...
Do I merge all the duplicates, and fill the rest with 6 two stars?
Do I merge all the 3* duplicates, level the duplicate 4*, and fill the rest with 5 two stars?
Or do I merge 2 duplicates, and level all the rest, ignoring the two stars?