Two foreground individuals in hard hats wear portable tanks as they walk behind someone in similar attire.
They are all coworkers.
The similar attire does not mean they are coworkers.
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 p1 x1.(n_thing(x1) & all x2.(n_coworker(x2) -> (x1 = x2)))