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Days (Mon-Sun) or Floors (Bottom-Top) should be fixed.
Write "A ≠ Top" on side. Don't forget it.
Always draw 2 possibilities at once.
Method:
Ground Floor = 1, Top Floor = n. Always write 1 to n from BOTTOM to TOP.
Example:
A lives on even floor below 5th.
Draw floors: 7,6,5,4,3,2,1. Don't write 1 at top.