 Couplet: "aa", but usually occurs as "aa bb cc dd ...". Enclosed rhyme ( or enclosing rhyme): "abba".
<fluency>  Couplet: "aa", but usually occurs as "aa bb cc dd ...". Enclosed rhyme ( or enclosing rhyme): "abba".
 Couplet: "aa", but usually occurs as "aa bb cc dd ...". Enclosed rhyme ( aka enclosing rhyme): "abba".