#include <bits/stdc++.h>
static const int MOD = 1000000007;
using ll = long long;
using u32 = unsigned;
using u64 = unsigned long long;
using namespace std;
template <class T>
constexpr T INF = ::numeric_limits<T>::max() / 32 * 15 + 208;
char buf[200001];
int main() {
  int q;
  cin >> q;
  while (q--) {
    int n;
    cin >> n;
    string s, t;
    cin >> s >> t;
    int a = 1, b = 0;
    for (int i = 0; i < n; ++i) {
      if (s[i] <= '2' && t[i] <= '2') {
      } else if (s[i] <= '2')
        b = 0;
      else if (t[i] <= '2')
        a = 0;
      else {
        swap(a, b);
      }
    }
    puts(b ? "YES" : "NO");
  }
  return 0;
}
