A group of people are taking part in a ceremony.
A group of people in a ceremony.
if they are taking part in the ceremony then they are in the ceremony.
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_ceremony(x4) & Theme(e1,x3) & Actor(e1,x1) & v_take(e1) & n_part(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & in(x2,x3) & n_ceremony(x3) & n_people(x2) & n_group(x1))