👉 A reversal is a sequence of steps in which one or more elements are swapped between two positions. In other words, it's like reversing a deck of cards, where you start with 52 cards and end up with 13 cards. For example: - If we have a deck of 52 cards, the first step would be to deal out all 52 cards face down on the table. - Then, we can flip over one card at a time, starting with the