If you have a coin: Heads and tails represent bits. Flip a coin three times and add up the result to emulate a six-sided dice roll. e.g., heads, heads, tails = 3. If you get 7, then try again.
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E.g. HHHHT -> HHT -> 6
Then depending on the next 2 throws
HH -> keep going
HT -> 6
TH -> 5
TT -> 4
For TTT similar with K,1,2,3