sentences:  If the bet is unsuccessful, the amount lost is appended to the end of the list.This process continues until either the list is completely crossed out, at which point the desired amount of money has been won, or until the player runs out of money to wager.The theory behind this Labouchère system is that, because the player is crossing two numbers off of the list (win) for every number added (loss) the player can complete the list, (crossing out all numbers) thereby winning the desired amount even though the player does not need to win as much as expected for this to occur.