These letters show the place the rhymes take place at the end of the traces. In ABAB, the very first and 3rd strains rhyme at the tip, as do the 2nd and fourth lines. In ABCB, just the 2nd and fourth traces rhyme at the top.Or, a author may well opt to use ballad or hymnal stanzas, such as All those used by Emily Dickinson (for instance, the very f