A person dressed in a black shirt and a person dressed in a blue shirt are standing on a mound of sand .
There is a better than even chance that the people standing on a mound of sand are waiting for a helicopter ride home .
It is impossible that the people standing on a mound of sand are waiting for a helicopter ride home .
There is a better than even chance that the people standing on a mound of sand are waiting for a helicopter ride home .
The people standing on a mound of sand are waiting for a helicopter ride home .