>>113392822Anon they count the whole closed hand as the fifth number in sequence.
1, 2, 3, 4 (fingers) 5 (transition to next hand), 6, 7, 8, 9, 10 (transition to next hand).
10 means your next counted digit will have to be on a new hand. It's like how a computer index iterates from 0 but they iterate from 1 finger to five (all fingers, transition hand)
