Four men (2 observing) with helmets are digging in the ground.
Four men are working together.
Just because four men, two of whom are observing, are digging in the ground does not mean that they are working together.
exists e1 x1 x2 x3 x4.(n_ground(x4) & in(e1,x4) & Actor(e1,x1) & v_dig(e1) & with(x1,x3) & n_helmet(x3) & rel(x1,x2) & n_observe(x2) & n_date(x2) & a_date_day_02(x2) & a_date_day_02(x2) & n_man(x1) & card_eq_4(x1))
exists e1 s1 x1.(a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_4(x1))