Four men stand holding picket signs referencing stances on immigration.
Four men are picketing.
The men are holding picket signs, so they are picketing.
exists e1 p1 x1.(exists e3 e2 x2 x3 x4 x5 x6.(Theme(e3,x2) & Actor(e3,x1) & v_hold(e3) & on(e2,x6) & n_immigration(x6) & Theme(e2,x5) & Actor(e2,x4) & v_reference(e2) & n_stance(x5) & (x2 = x4) & n_sign(x2) & of(x2,x3) & n_picket(x3)) & Topic(e1,p1) & Actor(e1,x1) & v_stand(e1) & n_man(x1) & card_eq_4(x1))
exists e1 x1.(Actor(e1,x1) & v_picket(e1) & n_man(x1) & card_eq_4(x1))