My line starts with 10 numbers
10 10 10 10 10 10 10 10 10 10
To decide how much to bet, you add the two outside numbers: 10 and 10
So your bet is whatever to win 20, so 22/20 on a -110 bet.
If the bet wins you clear the 2 numbers from the line. If the bet loses, you add the bet amount to the end of the line.
If bet wins, line looks like this:
10 10 10 10 10 10 10 10
If bet loses, line looks like this
10 10 10 10 10 10 01 01 10 10 22
You continue this process until all the numbers are cleared.
Does this clear it up a bit?