Seven laws each have eight sentences and seven words;
Each of the five laws has eight sentences and five words.
The number of sentences in sections 7 and 5 is half of that in sections 7 and 5 respectively.
First, metrical poems pay attention to rhyme, and rhyme feet are generally placed on 1, 2, 4, 6 and 8 sentences. The rhyme of modern poetry must strictly use only words with the same rhyme. Even if there are few words in this rhyme (called narrow rhyme), it can't be mixed with words in other rhymes, otherwise it is called rhyme, which is a big taboo of modern poetry.
Second, metrical poems pay attention to flat tones, and Chinese four tones can be roughly divided into flat tones. To cause cadence in tone, it is necessary to use flat voice and silence alternately. For Wuyan, its basic sentence patterns are: flat and flat or flat and flat; For Qiyan, its basic sentence pattern is: flat and flat, flat and flat or flat and flat.
Third, metrical poetry pays attention to persistence. Every two sentences (one and two, three and four, and so on) are called a couplet, the upper and lower sentences of the same couplet are called antitheses, and the lower and upper sentences of the couplet are called adjacent sentences. The composition rule of modern poetry is: antithesis and adjacent sentences stick together.
Contradiction means that the upper and lower sentences in a couplet are just the opposite. If the last sentence is: flat and light, the next sentence is: flat and light. Except for the first couplet, the last sentence of other couplets can't rhyme, and it must end with a sigh, and the next sentence must rhyme and end with a flat voice. Therefore, in addition to the first couplet, there are only two forms of antithesis in five-character modern poetry. Seven words are similar to this.