A fire engine sits near a cloud of thick smoke with one fireman on top of the truck and another fireman walking towards the smoke .
Chances are about even that two male firemen dressed in yellow prepare to fight a forest fire .
Chances are about even that two male firemen dressed in yellow prepare to fight a forest fire .
It is certain that two male firemen dressed in yellow prepare to fight a forest fire .
Two male firemen dressed in yellow prepare to fight a forest fire .