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 a person is dressed in a black shirt and standing on sand at a beach .
It is highly unlikely that a person is dressed in a black shirt and standing on sand at a beach .
There is a better than even chance that a person is dressed in a black shirt and standing on sand at a beach .
A person is dressed in a black shirt and standing on sand at a beach .