A boy does a cartwheel on a rock cliff .
There is a better than even chance that a boy is doing a cartwheel in front of a crowd of people .
There is a better than even chance that a boy is doing a cartwheel in front of a crowd of people .
It is improbable that a boy is doing a cartwheel in front of a crowd of people .
A boy is doing a cartwheel in front of a crowd of people .