A woman carrying a tube descends a flight of stairs.
A woman carries a tube up the stairs.
A tube cannot descend or the tube up simultaneously.
exists e2 e1 x1 x2 x3 x4 x5.(Theme(e2,x4) & Actor(e2,x1) & v_descend(e2) & of(x4,x5) & n_stair(x5) & n_flight(x4) & Theme(e1,x3) & Actor(e1,x2) & v_carry(e1) & n_tube(x3) & (x1 = x2) & n_woman(x1))
exists e1 x1 x2 x3.(n_stair(x3) & Theme(e1,x2) & Actor(e1,x1) & v_carry(e1) & up(x2,x3) & n_tube(x2) & n_woman(x1))