What is the fine-grained topic of the following text: On this page of the manuscript, the tail rhyme format of Sir Thopas with its bracketing links and lines placed to the right on the page still affects the text's layout, even though this section contains the end of the exchange between Harry Bailey and Chaucer, which is written in rhyming couplets. Only return the topic.
The layout and poetic structure of a manuscript section of Sir Thopas and its impact on the text.