Been known, OP. Been known. They've got everything it takes!
I've got an unpopular opinion. "O.O" and "TANK" were perfect as their first songs. The girls were able to demonstrate their skills and abilities perfectly through those. Singing, dancing, it was all there.
Think of those two songs as pre-debut songs. They're supposed to build hype and anticipation for the group. Pre-debut songs happen every now and then, but we don't talk about them since they're from smaller companies.
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