n = int(input())


for i in range(n):
    data = input().strip().split()

    for c in range(3):
        data[c] = int(data[c])

    data[0], data[2] = data[2], data[0]

    a = data[0]
    b = data[1]
    n = data[2]

    k = len(str(data[2]))
    k1 = len(str(data[1]))
    k2 = len(str(data[0]))

    spoj = list(str(data[1]) + str(data[0]))
    spoj.sort()

    sez = list(str(data[2]))
    sez.sort()
    g = a*b
    if (n == a*b and k1 == k2 and k == k1 + k2 and (a % 10 != 0 or b %10 != 0) and sez == spoj):
        print("YES")
    else:
        print("NO")