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Q and T stay on the same floor above the floor on which O stays, but not immediately above. S stays on the topmost floor. There are only three floors between T and V, both stay on flat no. 2. O stays just below W and both stays on flat no. 1. O does not stay on even numbered floor. N stays on immediately above P and both stays on the same flat number. P stays on even numbered floor.
Case (1) is the final arrangement.
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