Pantoum
The pantoum consists of a series of quatrains rhyming abab. The second and fourth lines of the first quatrain recur as the first and third lines in the following quatrain. Succeeding quatrains introduce a new second rhyme, i.e. abab bcbc. The form can include as many stanzas as the poet wishes as long as they follow this structure. The closing stanza opens with the second line of the previous stanza, but the second and fourth lines come from the first stanza.
Hence, the last stanza is structured like this:
Line 2 of previous stanza
Line 3 of first stanza
Line 4 of previous stanza
Line 1 of first stanza