Each of the five stanzas of "Grecian Urn" is ten lines long, measured in relatively precise iambic pentameter and divided into a two-part rhyme scheme , the last three lines of which are variables. The first seven lines of each stanza follow an ABABCDE rhyme scheme, but the second occurrences of the CDE sounds do not follow the same order. In stanza one, lines seven through ten are DCE rhymed; in verse two, CED; in rooms three and four, CDE; and in verse five, DCE, just like in verse one. As in other odes, the two-part rhyme scheme (the first part consisting of AB rhymes, the second of CDE rhymes) also creates the sense of a two-part thematic structure. The first four lines of each stanza roughly define the subject of the stanza, and the last six roughly explain or develop it. (As in other odes, this is just a general rule, true of some stanzas more than others; stanzas like the fifth do not closely link rhyme scheme and thematic structure