A toddler attempts to swing down a pole at the playground .
It is probable that a toddler swings down a pole when he hears that recess is over .
It is probably not the case that a toddler swings down a pole when he hears that recess is over .
It is probable that a toddler swings down a pole when he hears that recess is over .
A toddler swings down a pole when he hears that recess is over .