A kayaker wearing a blue wetsuit and black helmet paddles his yellow kayak in murky rolling rapids .
It is certain that a kayaker is paddeling a kayak in rapids with a group of his friends in other kayaks .
Chances are about even that a kayaker is paddeling a kayak in rapids with a group of his friends in other kayaks .
It is certain that a kayaker is paddeling a kayak in rapids with a group of his friends in other kayaks .
A kayaker is paddeling a kayak in rapids with a group of his friends in other kayaks .