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> he is only using the first (blue) tile

That's what I assumed too, but I didn't want to be sure of it because one have to be too stupid to do a demo of a product using always the same part. "Look I designed a keyboard and I can type with it: 'aaaaaaaaaaa'".

Okay, so it means that if I want to type 'n' I hit the 3rd tile and then I have to move four tiles away. Except I can't. So I guess I'll have to go backward when I reach the last tile in the direction I chose. But that seem to conflict with what I inferred for numbers…



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