import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
mod = 998244353
for _ in range(ni()):
    n, m = na()
    n %= 2*m
    if n < m:
        print((pow(10, n, mod)-1))
    else:
        print((pow(10, m, mod)-pow(10, n-m, mod)))