import sys
input = sys.stdin.readline

mod=10**9+7

FACT=[1]
for i in range(1,2*10**6+1):
    FACT.append(FACT[-1]*i%mod)

FACT_INV=[pow(FACT[-1],mod-2,mod)]
for i in range(2*10**6,0,-1):
    FACT_INV.append(FACT_INV[-1]*i%mod)

FACT_INV.reverse()

def Combi(a,b):
    if 0<=b<=a:
        return FACT[a]*FACT_INV[b]%mod*FACT_INV[a-b]%mod
    else:
        return 0

T=int(input())

for tests in range(T):
    H,W=list(map(int,input().split()))

    if H>W:
        H,W=W,H

    if H==1:
        print(0)
        continue
    
    ANS=(H-1)*2*Combi(H+W-3,W-2)

    print(ANS%mod)