Are you stupid? Then read the instructions. Otherwise, read the title!
So, all you need to do in your post is to combine the avatar of the person above you with your avatar.

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Everyone needs to read this:
Before the combination, you need to put the person above you's avatar, then your avatar, then do the combination.

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I can't start, because there's no one above me! But the person below me will start, combining their avatar with mine.

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By the way, people without avatars are not allowed to participate. Why? Because it will be hard to combine avatars.