S = input
R = range
P = print
def I(): return int(S())
def M(): return map(int, S().split())
def L(): return list(M())
def O(): return list(map(int, open(0).read().split()))
def yn(b): print("Yes" if b else "No")
biga = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
smaa = "abcdefghijklmnopqrstuvwxyz"

mod = 998244353

for _ in R(I()):
	n, m = M()
	n %= 2 * m
	if n > m:
		print((-1 - pow(10, n - m, mod)) % mod)
	else:
		print((pow(10, n, mod) - 1) % mod)