A unit of rhythm or meter, the division in verse of a group of syllables, one of which is long or accented. For example, the line, "The boy | stood on | the burn | ing deck," has four iambic metrical feet. The fundamental components of the foot are the arsis and the thesis. The most common poetic feet used in English verse are the iamb, anapest, trochee, dactyl and spondee, while in classical verse there are 28 different feet. The other metrical feet are the amphibrach, antibacchius, antispast, bacchius, choriamb, cretic, diiamb, dispondee, dochmius, molossus, proceleusmatic, pyrrhic and tribrach, plus two variations of the ionic, four variations of the epitrite, and four variations of the paeon. The structure of a poetic foot does not necessarily correspond to word divisions, but is determined in context by the feet which surround it.