In verse one can take any damn constant one likes, one can alliterate, or assone, or rhyme, or quant, or smack, only one MUST leave the other elements irregular.
Ezra Pound (1885–1972), U.S. poet, critic. Letter, July 30, 1920, to Ford Madox Ford. Published in Pound/Ford: The Story of a Literary Friendship, ed. Brita Lindberg-Seyersted (1982).