A brown dog appears to be operating a computer.
A dog poses by a computer.
Since it is opearting the computer it poses by it
exists e1 p1 s1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_appear(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_operate(e2) & n_computer(x2)) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))
exists e1 x1 x2.(by(e1,x2) & n_computer(x2) & Actor(e1,x1) & v_pose(e1) & n_dog(x1))