Line 2: 1 1

Line 3: 2 1

Line 4: 1 2 1 1

The fifth line:?

Supplementary question: What is the reason?

Very simple, the answer is111221.

In fact, each line is a "statistic" of the previous line, and Chinese characters are removed.

The first line: "1" is: 1 1. If you remove the word "a", it becomes "1 1", which is the second line.

Similarly, the second line can also be counted as: two 1. If the word "a" is removed, it becomes "2 1", which is the third line.

Similarly, the third line can also be counted as 1 2 and 1 1. If the words "Ge" and "He" are removed, it becomes "12 1 1", which is the fourth line.

Similarly, the fourth line can be counted as: 1 1 and 1 2 and 2 1. If the words "Ge" and "He" are removed, it becomes "1 122 1".