from atcoder.segtree import SegTree
def main():
    n = int(input())
    P = list(map(lambda x: int(x)-1, input().split()))
    Q = list(map(lambda x: int(x)-1, input().split()))
    st = SegTree(lambda a, b: max(a, b), 0, [0]*2*n*n)
    #st1 = SegTree(lambda a, b: max(a, b), 0, [0]*n*n)
    ans = 0
    N = n*n
    for pi in range(n):
        st_ = SegTree(lambda a, b: max(a, b), 0, [0]*2*n)
        for qi in range(n):
            p, q = P[pi], Q[qi]
            a = st.prod(2*qi*n+p, 2*qi*n+n+p)+1
            ans = max(ans, a)
            st_.set(q, a)
            st_.set(n+q, a)
            x, y = st_.prod(q+1, n), st_.prod(n, n+q)
            #print(p, q, x, y, a, "here", *[st1_.get(i) for i in range(n)])
            st.set(2*qi*n+p, x)
            st.set(2*qi*n+n+p, y)
    return ans

for _ in range(int(input())):
    print(main())