A brown dog swims through water outdoors with a tennis ball in its mouth .
There is a better than even chance that a brown dog is swimming in a lake with a tennis ball in its mouth .
There is a better than even chance that a brown dog is swimming in a lake with a tennis ball in its mouth .
It is impossible that a brown dog is swimming in a lake with a tennis ball in its mouth .
A brown dog is swimming in a lake with a tennis ball in its mouth .