Terza Rima

A quick note on rhyming schemes in terza rima while I have it in mind -
There are two ways to handle it. The first is as Leanne proposes ie ending in a couplet:

     aba bcb cdc ded (etc.) ee

The other option is to make the end come back to the beginning so that each stanza has 3 lines, and each rhyme is used 3 times:

     aba bcb cdc ded (etc.) eae

The second is my personal preference (I like the symmetry and the 'threeness of things') except if I am intending to write a sonnet, but of course both forms are equally valid.