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It looks like you added lots of '4' to the string of numbers I came up  |
... so turns out hex braille codes are the same as the numbers with a "4" at the start hahaha. Perhaps not the right way.
Think you've gone the right way, Xav, but I'm not sure what converting it to numbers has to do with piece 7. It does seem to be what Ed wanted us to do, though.