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- def n_p(x, y):
- if x > y:
- return 0
- if x == y:
- return 1
- if x < y:
- return n_p(x+1, y) + n_p(2*x+1, y)
- print (n_p(1, 27) - n_p(1, 26)*n_p(26, 27))
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