A group of men and women are hiking through a dried up river bed littered with large rocks , which runs between two rocky walls in a dense green forest .
It is impossible that a group of people is sitting in a room listening to a lecture .
It is impossible that a group of people is sitting in a room listening to a lecture .
We believe that a group of people is sitting in a room listening to a lecture .
A group of people is sitting in a room listening to a lecture .