Two construction workers sitting on some pipes while one waves, obscuring his face.
Two workers are messing around on the job.
Sitting on some pipes does not imply messing around.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7.(Theme(e2,x7) & Actor(e2,x5) & v_obscure(e2) & n_face(x7) & of(x7,x2) & n_male(x2) & n_worker(x5) & of(x5,x6) & n_construction(x6) & card_eq_2(x5) & while(e1,x4) & n_wave(x4) & card_eq_1(x4) & on(e1,x3) & n_pipe(x3) & Actor(e1,x1) & v_sit(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))
exists e1 s1 x1 x2.(n_job(x2) & a_around(s1) & Manner(e1,s1) & on(e1,x2) & Actor(e1,x1) & v_mess(e1) & n_worker(x1) & card_eq_2(x1))