A person on a dirt-bike motorcycle wearing multicolored protective clothing and helmet spinning out on top of a sand dune with sand spurting out in a rooster tail behind the motorcycle .
It is certain that a motorcyclist celebrates by making a dirt rooster tail with sand after winning a competition .
It is improbable that a motorcyclist celebrates by making a dirt rooster tail with sand after winning a competition .
It is certain that a motorcyclist celebrates by making a dirt rooster tail with sand after winning a competition .
A motorcyclist celebrates by making a dirt rooster tail with sand after winning a competition .