Iambic are those two successive lines.
Pentameter in count is what defines
The length their feet walk ere they make a turn
And walk another line from stem to stern.
The couplet like a man and wife both chime,
As one paired mate, together in a rhyme.
Great Chaucer used them, but it took a Pope
To make them popular in use and scope.
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https://en.wikipedia.org/wiki/Heroic_couplet
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examples:
The poem above is an example of heroic couplets.
https://thebardonthehill.wordpress.com/2015/03/13/on-donnes-poetry-by-samuel-taylor-coleridge/
https://thebardonthehill.wordpress.com/2015/06/08/a-prayer-in-spring-by-robert-frost/
https://thebardonthehill.wordpress.com/2013/06/06/vice-by-alexander-pope/
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© Dennis Lange and thebardonthehill.wordpress.com, 2015.
The Bard on the Hill 