two men are working on the treads of a large piece of equipment.
Two men are cleaning mud off of the large piece of equipment.
we don't know they are cleaning mud.
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 p1 s1 x1 x2.(n_piece(x2) & a_large(s1) & Theme(s1,x2) & exists e2 x3.(of(e2,x2) & of(x2,x3) & n_equipment(x3) & r_off(e2) & Theme(e2,x1) & v_mud(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_clean(e1) & n_man(x1) & card_eq_2(x1))