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def nCr(n,k):
if k<0 or k>n:
return 0
k=min(k,n-k)
res=1
for i in range(1,k+1):
res=res*(n-k+i)//i
return res
T=int(input().strip())
for i in range(T):
parts=input().split()
k=int(parts[0])
s=parts[1].strip()
d=len(set(s))
print(nCr(d,k))
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