Meh, we all know SNSD is one big OT9 anyway.

Kind of like the Gorokkies OT5, but even stronger.

Seriously, basic math. lulz f(x) has nothing on C(n,r)=n!/(r!(n-r)!)
Number of people Number of combinations
2 36
3 84
4 126
After this, the numbers start decreasing, but why the hell you would want to exclude a minority of members at that point is beyond me. Even so, you can't deny that all 462 combinations have empirical evidence.
So lucky for you, yes, you CAN ship ALL of your favorites together and it will work.