Man in a gas mask completes a painting outside a wall.
The man is not wearing a gas mask.
In a gas mask is different than not wearing a gas mask.
exists e1 x1 x2 x3 x4 x5.(outside(e1,x5) & n_wall(x5) & Theme(e1,x4) & Actor(e1,x1) & v_complete(e1) & n_painting(x4) & in(x1,x2) & n_mask(x2) & of(x2,x3) & n_gas(x3) & n_man(x1))
exists x1.(n_man(x1) & -exists e1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_mask(x2) & of(x2,x3) & n_gas(x3)))