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user-inactivated · 4815 days ago · link ·
Well, when you said it was better in capitals I understood it would be based on shapes, so:
- each letter from the first group can be divided vertically and mirrored (not sure how to explain: basically the shape on the left is a mirror of the shape on the right)
- each letter from the second group works the same but horizontally -> that one was especially difficult for me to find out as I somehow see more easily a vertical mirroring
- i guess there is no rule appliable to the group 3, it's just "all the rest"
- each letter from the fourth group can be divided vertically AND horizontally
Voila ;)