Can there be word repetition in the seven laws?

The plane format of regular poems is strict, but it is also flexible. Under certain conditions, some places can be flexible. In the works of ancient poets, it is so common to change the level tone format that it is not easy to find the rigidity of metrical poems. Elasticity is not arbitrary, but has certain rules. When ancient poets wrote poems, there was often a word that did not conform to the level-leveled sentence pattern, which was called "awkward" or "awkward sentence". Now that it is "difficult", we can take appropriate measures to remedy it, which is called "difficult to save"

On "One, Three and Five Regardless"

A modified formula was put forward by predecessors: "No matter what 135 is, 246 is clear." Here refers to the seven laws, which means that the level of the three words of one, three and five in each sentence can be "whatever", and "whatever" is flexible; The word 246 must be "different", and "different" means strict format. As for the seventh word, the rhyming word is flat and the non-rhyming word is flat, which is fixed and must be mentioned. There are only five words in each sentence of the five laws, and this employment will naturally become "no matter whether one or three, two or four are clear."

This employment can sum up some phenomena, but it cannot be generalized. Some places can be ignored, and some places must be discussed. So some people say: "135 is not necessarily irrelevant, and 246 is not necessarily clear"; In other words, elasticity has certain conditions.

Regarding the first word, the level of the first word in each sentence of the Seven Laws can be completely flexible, and the level can be used. But there is one exception, that is, the first word of every sentence in the Five Laws and the third word of every sentence in the Seven Laws. When it comes to the sentence pattern of flat (or flat), its flat is inflexible.

Why can't the first word of the five-character "Pingqi" and the third word of the seven-character "Pingqi" be flexible? Because if it becomes a flat voice, then this sentence becomes a five-character "flat and flat" and a seven-character "flat and flat" sentence, and only the second word (the fourth word in the seven-character sentence) is flat, which is called a flat voice. "Offending loneliness" is a taboo in regular poetry. But "solitary flat" is limited to this sentence pattern, and other sentence patterns are not "solitary flat" if they only have a flat sound.

Except this sentence pattern, the first word of other sentence patterns (one or three words in a seven-character sentence) can be leveled.