There are two kinds of signatures: one is to write only the name of the calligrapher. The double paragraph is to write the names of both the recipient and the calligrapher. Among them, a single paragraph can be divided into short paragraphs and long paragraphs according to the number of words.
If you write two paragraphs, the receiver should be at the front and the writer should be at the back. This is a way to show respect.