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When all three shapes have been used, you get three more.
Complete a solid line horizontally or vertically, and it vanishes.
So yes there are some bad things and good things about Snapchat. This makes it a lot harder to focus on the names of the people, as so many bitmojis are very similar.
It was easier to see the names without the bitmojis there, and quite honestly it's just stupid and pointless to put them by the peoples' names.
Life's more fun when you live in the moment :) Happy Snapping!