1333A - Little Artem

using namespace std;
int main(void)
{
    int t, n, m;
    cin >> t;
    while (t--)
    {
        cin >> n >> m;
        bool black = true;
        for (int row = 0; row < n; ++row)
        {
            for (int col = 0; col < m; ++col)
            {
                if (row == 0 and col == 1 and (n * m) % 2 == 0)
                    cout << (black ? "W" : "B");
                else
                    cout << (black ? "B" : "W");
                black = !black;
            }
            cout << endl;
        }
    }
    return 0;
}