Two foreground individuals in hard hats wear portable tanks as they walk behind someone in similar attire.
The three people all work together.
The similar attire does not mean they work together.
exists e1 p1 s1 s2 s3 x1 x2 x3.(exists e2 s4 x4 x5.(behind(e2,x4) & in(x4,x5) & n_attire(x5) & a_similar(s4) & Theme(s4,x5) & n_person(x4) & Actor(e2,x1) & v_walk(e2)) & n_thing(x1) & as(e1,p1) & Theme(e1,x3) & Actor(e1,x1) & v_wear(e1) & n_tank(x3) & a_portable(s3) & Theme(s3,x3) & in(x1,x2) & n_hat(x2) & a_hard(s2) & Theme(s2,x2) & n_individual(x1) & a_foreground(s1) & Theme(s1,x1) & card_eq_2(x1))
exists x2.(n_people(x2) & card_eq_3(x2) & all x1.((x1 = x2) -> exists e1 s1.(a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1))))