MOD = 998244353

t = int(input())
for _ in range(t):
    hc, ac, sc, hg, ag, sg = map(int, input().split())
    
    cnt = min((hc - 1) // ag, (hg - 1) // ac)
    hc -= ag * cnt
    hg -= ac * cnt

    ans = 0
    if hc - ag <= 0:
        cnt = (hg - 1) // ac
        prob = pow(pow(10, -1, MOD), cnt, MOD)
        prob %= MOD
    else:
        cnt = (hc - 1) // ag
        prob = pow(pow(10, -1, MOD), cnt, MOD)
        ans += 1 - prob
        prob %= MOD
    
    if sc == sg:
        ans += prob * pow(2, -1, MOD)
    elif sc > sg:
        ans += prob * 10 * pow(11, -1, MOD)
    else:
        ans += prob * pow(11, -1, MOD)
    
    ans %= MOD
    print(ans)