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7->T is definitely the most oblique of the four numbers. I'd say that 0 as O is completely unobjectionable, and 1 as I mostly so. It's a lot easier for me to read #c0ffee than #7a57e5.

He makes a direct reference to leetspeak [0] which has leet/1337 even in the name. As someone who grew up alongside gaming, the T/7 connection is acceptable without issues.

[0] https://en.wikipedia.org/wiki/Leet

Also, go get from T to 7 is a few degrees of rotation.

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