The Elegiac couplet reference article from the English Wikipedia on 24-Apr-2004
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Elegiac couplet

Elegiac couplets consist of alternating lines of dactylic hexameter and pentameter: two dactyls followed by a long syllable, a caesura, then two more dactyls followed by a long syllable.

Example:

 In the Hexameter rises the fountain's silvery column,
 In the pentameter aye falling in melody back.

See also