The rhyming conventions of the new verse had been codified inside a rime dictionary called the Zhongyuan Yinyun (1324). A radical departure from the rime table custom that had advanced over the previous generations, this dictionary consists of a wealth of data about the phonology of Old Mandarin. More sources https://servicessuchasb2b99642.bmswiki.com/4960710/new_step_by_step_map_for_so_please_be_respectful_to_your_escort_girl