The idea is to play the progression until you win twice in a row playing two dozens.
On a loss, move to the next step,
on a win rebet the same amount staying on the same step.
Step 0 shows 2(1+1) means bet 1 on each dozen.
Step 4 shows 12(6+6) means bet 6 on each dozen.
It is better than playing the martingale, and covers more numbers,
plus the profit goes up as it is played.
(https://i.imgur.com/qciZDe5.png)
Those calculations were way off. The bet sequence is
5, 6, 12, 24, 48, 96, 192 on each dozen.
On a win, rebet and if that wins then reset. You are looking for a double win.