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def stirling(n,k):
n1=n
k1=k
if n<=0:
return 1
elif k<=0:
return 0
elif (n==0 and k==0):
return -1
elif n!=0 and n==k:
return 1
elif n<k:
return 0
else:
temp1=stirling(n1-1,k1)
temp1=k1*temp1
return (k1*(stirling(n1-1,k1)))+stirling(n1-1,k1-1)
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