#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
const long MOD = 998'244'353;
int main() {
	int T;
	cin >> T;
	const long inv11 = inv_mod(11, MOD);
	const long inv10 = inv_mod(10, MOD);
	const long inv2 = inv_mod(2, MOD);
	for (auto _ : views::iota(0, T)) {
		long Hc, Ac, Sc, Hg, Ag, Sg;
		cin >> Hc >> Ac >> Sc >> Hg >> Ag >> Sg;
		long tc = (Hc + Ag - 1) / Ag;
		long tg = (Hg + Ac - 1) / Ac;
		long same = 9 * inv11 % MOD * pow_mod(inv10, abs(tc - tg), MOD) % MOD;
		long c_win, g_win;
		if (tc >= tg) {
			g_win = inv11 * pow_mod(inv10, tc - tg, MOD) % MOD;
			c_win = (2 * MOD + 1 - g_win - same) % MOD;
		} else {
			c_win = inv11 * pow_mod(inv10, tg - tc, MOD) % MOD;
			g_win = (2 * MOD + 1 - c_win - same) % MOD;
		}
		long ans = c_win;
		if (Sc > Sg) {
			ans += same;
			ans %= MOD;
		} else if (Sc == Sg) {
			ans += same * inv2 % MOD;
			ans %= MOD;
		}
		println("{}", ans);
		assert(0 <= ans && ans < MOD);
	}
}