two men are working on the treads of a large piece of equipment.
There are people working.
men constitute people
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 p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_work(e1) & (x2 = x3) & n_people(x2))