Two flaggers chatting on a construction site.
Two flaggers are at a construction site.
Chatting at a construction site implies being at a construction site.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_site(x3) & of(x3,x4) & n_construction(x4) & Actor(e1,x2) & v_chat(e1) & (x1 = x2) & n_flagger(x1) & card_eq_2(x1))
exists p1 x1.(exists x2 x3.(at(x1,x2) & n_site(x2) & of(x2,x3) & n_construction(x3)) & n_flagger(x1) & card_eq_2(x1))