MOD = 10 ** 9 + 7
fac = [1] * (4 * 10 ** 5 + 10)
for i in range(len(fac) - 1):
    fac[i + 1] = fac[i] * (i + 1) % MOD
t = int(input())
for _ in range(t):
    h, w = map(int, input().split())
    if h == 1 or w == 1:
        print(0)
    else:
        print(fac[h + w - 3] * pow(fac[h - 2] * fac[w - 2], MOD - 2, MOD) * 2 % MOD)