What kinds of couplets are there?

1 can be divided into Spring Festival couplets, festival couplets, door couplets, professional couplets, wedding couplets, birthday couplets, elegiac couplets, communication couplets, places of interest couplets, church couplets, calligraphy and painting couplets, literary and art couplets, temple fairs, celebration couplets, propaganda couplets, topic couplets, miscellaneous couplets, academic couplets, and interesting couplets.

According to the artistic form, it can be divided into: palindrome couplets, overlapping couplets, thimble couplets, inlay couplets, set sentence couplets, edge couplets, word-splitting couplets, glazed couplets and ruthless equivalence.

According to the number of words in couplets, they are divided into long couplets and short couplets.

According to the number of sentences and the relationship between sentences, couplets can be divided into three types: single sentence couplet, complex sentence couplet and sentence group couplet.

According to the metrical requirements and rigor of antithesis, couplets can be divided into wide antithesis, work antithesis, skillful antithesis and absolute antithesis.

According to the content correspondence of the upper and lower couplet, it is divided into positive pair, negative pair and flow pair.

According to the writing skills or rhetorical devices of couplets, they can also be divided into inlays, palindromes, riddles, sets of sentences, hidden words and rhymes.

The above categories are the aspects I summarized. In fact, there are many classification forms, and there are many kinds of couplets.