What are hexaduad poem examples?

A hexaduad is a poem made up of 12 lines, a combo of six separate couplets 2 lines each. Each couplet must rhyme. It is basically a 12 line poem with every 2 lines rhyming. Here the rhyme scheme aa,bb,cc,dd,ee,ff. It tells a complete thought. Each line must have the same beat too.