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SUBMIT YOUR IDEA:-) this is a good challenge - makes you think about base 6 numbering systems...
Super impressed with @jdunkerley79 's and @estherb47 's solution (few tools - exhaust the problem space)
Here's my solution... an assisted one as I couldn't have done it without peeking at @jdunkerley79 's MOD function.
Decided to reverse-engineer it so it's probably a shorter workflow than most