I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "Catalan is split in two major dialectal blocks: Eastern Catalan, and Western Catalan. The main difference lies in the treatment of unstressed a and e; which have merged to /ə/ in Eastern dialects, but which remain distinct as /a/ and /e/ in Western dialects. There are a few other differences in pronunciation, verbal morphology, and vocabulary."? 

What has disappeared in one dialect?