A kayaker in whitewater rapids between two rocks , and a bystander on a rocky shore watching .
It is certain that a kayaker in whitewater rapids is between two rocks , while a bystander watches .
It is certain that a kayaker in whitewater rapids is between two rocks , while a bystander watches .
Chances are slight that a kayaker in whitewater rapids is between two rocks , while a bystander watches .
A kayaker in whitewater rapids is between two rocks , while a bystander watches .