These letters suggest where by the rhymes occur at the conclusion of the strains. In ABAB, the main and 3rd strains rhyme at the tip, as do the second and fourth lines. In ABCB, just the second and fourth strains rhyme at the top. But, far more typically, they use https://gregoryitcjp.blogs100.com/27734992/a-review-of-types-of-rhymes-in-poems