def solve():
	H1, A1, S1, H2, A2, S2 = map(int, input().split())
	t = min((H1-1)//A2, (H2-1)//A1)
	H1 -= A2*t
	H2 -= A1*t
	
	if H1 <= A2:
		n = (H2-1)//A1
		temp = 0
		if S1 > S2:
			temp = 10*pow(11, -1, 998244353)
		elif S1 < S2:
			temp = pow(11, -1, 998244353)
		else:
			temp = 499122177
		print(temp*pow(10, -n, 998244353)%998244353)
	elif H2 <= A1:
		n = (H1-1)//A2
		temp = 0
		if S1 < S2:
			temp = 10*pow(11, -1, 998244353)
		elif S1 > S2:
			temp = pow(11, -1, 998244353)
		else:
			temp = 499122177
		print((1-temp*pow(10, -n, 998244353))%998244353)
	else:
		print(0)
for i in range(int(input())):
	solve()