main.py

nTst = int(input())

for i in range(nTst):

    for i in range(nTest):

        n = int(input())
        arr = input().split(" ")
        arr = list(map(int, arr))
        se = input()
        start, end = int(se.split(" ")[0]), int(se.split(" ")[1])



        val = start

        for i in range(n-1):
            #val = start

            start = arr[val-1]
            val = start

        if start == end:
            print("Yes")
        else:
            print("No")