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1. P lives on one of the odd numbered floor above Y but not on top floor. 2. Only three persons lives between B and P. 3. N lives immediately before B.
There is no floor empty for N in CASE1 so CASE1 is cancelled out.
4. A lives on an odd numbered floor but not on the floor numbered 3. 5. Z lives on immediately below A. 6. Only one person lives between Z and M and they lives on even numbered floor.
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