Two photographers cataloging an event.
There are two photographers taking pictures.
Two photographers are cataloging an event by taking pictures.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_catalog(e1) & n_event(x3) & (x1 = x2) & n_photographer(x1) & card_eq_2(x1))
exists p1 x1 e1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_take(e1) & n_picture(x4) & (x2 = x3) & n_photographer(x2) & card_eq_2(x2))