#include <array>
#include <iostream>
#include <vector>

#include <atcoder/dsu>

int main() {
    int t;
    std::cin >> t;
    while (t-- > 0) {
        int n;
        std::cin >> n;

        std::vector<std::vector<int>> nums(3);
        std::vector<std::vector<int>> cols(n);

        for (int i = 0; i < n; ++i) {
            char c;
            int d;
            std::cin >> c >> d;
            --d;

            int col = c == 'R' ? 0 : c == 'G' ? 1 : 2;
            nums[col].push_back(d);
            cols[d].push_back(col);
        }

        int c = 0;
        for (int i = 0; i < 3; ++i) {
            c += nums[i].size() != 0;
        }
        if (c == 1) {
            std::cout << "YES" << '\n';
            continue;
        }
        if (c == 2) {
            std::string ans = "NO";
            for (int i = 0; i < n; ++i) {
                if (cols[i].size() >= 2) {
                    ans = "YES";
                }
            }
            std::cout << ans << '\n';
            continue;
        }

        int cnt = 0;
        atcoder::dsu uf(3);
        for (int i = 0; i < n; ++i) {
            int siz = cols[i].size();
            for (int j = 0; j < siz - 1; ++j) {
                int c1 = cols[i][j];
                int c2 = cols[i][j + 1];
                uf.merge(c1, c2);
            }
            cnt += siz >= 2;
        }
        if (uf.groups().size() >= 2) {
            std::cout << "NO" << '\n';
            continue;
        }
        {
            bool ok = false;
            for (int i = 0; i < 3; ++i) {
                if (nums[i].size() == 1) {
                    ok = true;
                }
            }
            if (ok) {
                std::cout << "YES" << '\n';
                continue;
            }
        }

        if (cnt >= 2) {
            std::cout << "YES" << '\n';
            continue;
        } else {
            std::cout << "NO" << '\n';
            continue;
        }

    }
}