A cat proved that Ethan tried to sneeze .
cat ( x _ 1 ) AND prove . agent ( x _ 2 , x _ 1 ) AND prove . ccomp ( x _ 2 , x _ 5 ) AND try . agent ( x _ 5 , Ethan ) AND try . xcomp ( x _ 5 , x _ 7 ) AND sneeze . agent ( x _ 7 , Ethan )