Do-baytī (which, however, is very close to standard Persian). An example of one of his poems is the following: Do-baytī Do-bayti () (literally "two-couplet"), also known as "fahlaviyat", is an ancient form of Persian poetry. It is used to describe a Persian quatrain (a stanza or poem of four lines), similar to Ruba'i but different in meter. A "do-bayti" has four half-lines of 11 syllables each, and usually uses the "hazaj" meter: The first two syllables may sometimes be replaced by – u or – –. The rhyme scheme is "a a a a" or "a a b a". A well-known
Regulated verse are rhymed on the even lines, with one rhyme being used throughout the poem. Also, and definitionally, the tonal profile of the poem is controlled (that is, "regulated"). Furthermore, semantic and tonal parallelism is generally required of certain interior couplets. During the Tang Dynasty, the "Shen-Song" team of Shen Quanqi and Song Zhiwen greatly contributed to the development of this Classical Chinese verse form. Regulated verse consisting of the three "jintishi" or "new style poetry" forms of "lushi", "jueju", and "pailu" while retaining the basic characteristics that are distinguished from the "gushi" or "old style poetry" by the addition of