Five children spin around on a playground roundabout ; three lay on their backs , while one attempts to pull himself up with both arms , and another holds onto the side while sitting up .
It is almost certain that a group of children are practicing their ballet routine at the playground .
It is impossible that a group of children are practicing their ballet routine at the playground .
It is almost certain that a group of children are practicing their ballet routine at the playground .
A group of children are practicing their ballet routine at the playground .