two men are working on the treads of a large piece of equipment.
Two men sit on top of a large piece of equipment.
Two men cannot sit on and be working on large equipment simultaneously.
exists e1 s1 x1 x2 x3 x4.(n_tread(x2) & on(e1,x2) & of(x2,x3) & of(x3,x4) & n_equipment(x4) & n_piece(x3) & a_large(s1) & Theme(s1,x3) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3 x4.(on(e1,x2) & of(x2,x3) & of(x3,x4) & n_equipment(x4) & n_piece(x3) & a_large(s1) & Theme(s1,x3) & n_top(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & card_eq_2(x1))