Separate - Separate

...This four-six sentence is made up of only couplets, two of which are short and four of which are long. The former are called short couples and the latter are called long couples. Short couples are light and airy, long couples are heavy, and heavy long couples are so heavy that two pairs are not used in a row, but one or two pairs of light and airy phrases are always inserted between them. The phrases end with a rhyme. ...

*Some of the terminology explanations that mention "separate pairs" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…この四六文は対句（ついく）のみでできていて，2句の対句と4句の対句がある。前者を短対（たんつい），後者を隔対（かくつい）といい，短対は軽快，隔対は重厚であり，重厚な隔対は重厚なるがゆえに2対つづけて用いず，必ずその間に軽快な単句を1対または2対挿入する。句末には脚韻を押韻する。…

※「隔対」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報