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 .
Two men ride side by side in a sand dune .
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.
Two men ride side by side in a sand dune.
men on top of a sand dune cannot be  in a sand dune.
men on top of a sand dune can not be in a sand dune .