li = [0] * 60

n = int(input())

for i in range(1,n + 1):
    # m,*v = list(map(int,input().split())) 这么写也可以
    v = map(int,input().split()[1:])
    li[i] = set(v)

k = int(input())
while k > 0:
    k -= 1
    a,b = map(int,input().split())
    nc = len(li[a] & li[b])
    nt = len(li[a] | li[b])
    print(f'{nc / nt * 100:.1f}%')