How do you deal with that? Team comp

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generally by separating them and getting them one at a time with a full team. its not impossible, and that team comp certainly sounds annoying, but they're at the disadvantage.

That might work, but your ability to actually separate the team is going to be depended on having a good enough advantage. Otherwise, they will completely disregard any attempt to bait them, and play to their strengths.

If they got 2 GA's because of an item advantage, good luck.