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a group of strict Welsh poetic metres. The most popular form is the englyn unodl union ("direct monorhyme englyn"), which is a combination of a cywydd, a type of rhyming couplet, and another form and is written in an intricate pattern of alliteration and rhyme called cynghanedd. The englyn unodl union consists of 30 syllables in lines of 10, 6, 7, and 7 syllables. In this form the last syllables of the last three lines rhyme with the 6th, 7th, 8th, or 9th syllable of the first line. The various forms of englyns were among the 24 strict bardic metres available to Welsh poets from roughly the 14th century.