Two men , wearing hard hats and blue and yellow coats stand in front of a large machine and smile .
We believe that some of the men wearting hats are preparing to work on the machine .
We doubt that some of the men wearting hats are preparing to work on the machine .
We believe that some of the men wearting hats are preparing to work on the machine .
Some of the men wearting hats are preparing to work on the machine .