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1. Z lives on 7th floor. 2. Two person live between Z and A. 3. W live immediately above A. 4. There is as many person living living above W as below U.
There is no floor empty for U in CASE2 so CASE2 is cancelled out. 5. T live above Y. 6. Five persons live between Y and D, who lives below Z.
7. Only one person live between Z and V. 8. B live above X but not immediately. 9. X does not live immediately above or immediately below V.