A photo of a binary-entry keypad, with a few operator keys, and quick-reach variations on 0 and 1 entry. In the centre are 0 and 1. To their left and right are 00 and 11. Above, 01 and 10. In the eight corner keys remaining are all three permutations of three-bit strings from 000 through to 111.
https://files.bitbang.social/media_attachments/files/112/617/519/635/469/127/original/48ebcd4711279fb2.png
Nanoraptor
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