This is a two-dimensional array, so the first Chinese character of each line is output. A Chinese character takes up two bytes, which can be understood as one Chinese character equal to two English characters. There are three forms:
1. The six sentences in the first couplet and the second couplet all describe the scene contained in it, without revealing the meaning of the title. The theme is not highlighted until the couplet.
2. The first word of the poem is hidden in the last word.
3. Hide what you say at the beginning of the poem. What is common now is the third type. The first word of each sentence is read together to convey some unique thoughts of the author.