Law: number of covers = total love-number of covers+1.

In fact, the genius of this problem is that the given condition is covered by adjacent graphs every time! So we just need to walk from left to right one by one. When two sheets of paper are covered at the same time, the first two sheets are a group, then the third and second sheets, the fourth and third sheets, and so on ... When three sheets of paper are covered at the same time, the first group is the first three sheets, and the second group is the last three sheets ... So we find that when we cover several sheets of paper, we count from the first sheet, so it is the above rule.