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A difficult password problem in junior high school mathematics thinking questions
∫a+2b, 3b, c+2d and 3d are all ∑.

∴ A+2b = 9 or 35 or 6 1,

3b = 16 (not a multiple of 3) or 42 or 68 (not a multiple of 3).

C+2D = 23 or 49 or 75(c and D cannot be equal, give up).

3d = 12 or 38 (not a multiple of 3 and) or 64 (not a multiple of 3 and).

∴a=- 19(7 sheds) or 33 sheds (more than 25 sheds)

b= 14

C= 15 or 41(more than 25 buildings)

d=4

∴a=h b=o c=p d=e

The password list is hope's hope.