Rhythm. The beat or movement of a line is referred to as rhythm. This includes, for example, an unstressed syllable followed by a stressed syllable. A metrical pattern is a sequence of these pairs (or some other fixed number) that repeats throughout the length of the poem. Syllabic verse has one foot of each line containing from three to seven syllables. Dactylic (or dactylous) verse has two feet of four and five syllables respectively. Iambic verse has two feet of two syllables each. Tetrameter rhyme uses four-syllable lines in an alternating pattern with five-syllable lines. Trimeter rhyme uses three-syllable lines in an alternating pattern with four-syllable lines. Isonomic (or isonomia) verse does not use any particular metric scheme but instead follows a regular pattern of strong and weak syllables throughout the poem. Isodiametric verse is composed using lines of equal length that vary in strength. Anadiplosis occurs when a word or phrase at the end of one sentence is repeated at the beginning of the next. It is often used to close a letter, article, or book.