Three women dance before a flag.
They danced near a flag.
Three women is a group, which can be referred to as "they", and the flag indicates it is the same group.
exists x1 x2 x3.(a_topic(x1) & before(x1,x3) & n_flag(x3) & n_dance(x1) & of(x1,x2) & n_woman(x2) & card_eq_3(x1))
exists e1 x1.(near(e1,x1) & n_flag(x1) & Actor(e1,x1) & v_dance(e1) & n_thing(x1))