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- def powm(a,n,m):
- def power(a, n):
- if n == 0:
- return 1
- elif n % 2 == 1:
- return power(a, n - 1) * a
- else:
- return power(a, n // 2) ** 2
- c=power(a,n)
- k=c%m
- return k
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