a black and white dog jumping into a pool with a lot of tennis balls in it .
It is probable that two dogs , a black and a white one , follow a thrown tennis ball into a pool full of them .
It is highly unlikely that two dogs , a black and a white one , follow a thrown tennis ball into a pool full of them .
It is probable that two dogs , a black and a white one , follow a thrown tennis ball into a pool full of them .
Two dogs , a black and a white one , follow a thrown tennis ball into a pool full of them .