#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
int main () {
	int T1, T2;
	cin >> T1 >> T2;
	if (T1 < T2) swap(T1, T2);
	T2--;
	std::vector<mint> kai(100010, 1), fkai(100010);
	for (int i = 1; i < 100010; i ++) kai[i] = kai[i-1] * i;
	fkai.back() = kai.back().inv();
	for (int i = 100010-1; i; i --) {
		fkai[i-1] = fkai[i] * i;
	}
	for (int t = 0; t < T1; t ++) {
		int N, M;
		cin >> N >> M;
		if (t == T2) {
			puts("-1");
		} else {
			cout << (kai[M] * fkai[N] * fkai[M-N]).val() << endl;
		}
	}
}