#include <bits/stdc++.h>
using namespace std;

using i64 = long long;
const int P = 998244353;

int qpow(int b, int k) {
    int ret = 1;
    while(k > 0) {
        if(k & 1) ret = ret * (i64)b % P;
        b = b * (i64)b % P;
        k >>= 1;
    }
    return ret;
}

int solve() {
    int n, m;
    cin >> n >> m;
    n %= 2 * m;
    if(m >= n) return qpow(10, n) - 1;
    else return (P + qpow(10, m) - qpow(10, n - m)) % P;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    
    int T;
    cin >> T;
    while(T --)
        cout << solve() << "\n";
}