A group of young adults singing in a choir.
A choir group practices for a competition.
The group is not necessarily practicing for a competition.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & in(e1,x4) & n_choir(x4) & Actor(e1,x3) & v_sing(e1) & (x2 = x3) & n_adult(x2) & a_young(s1) & Theme(s1,x2) & n_group(x1))
exists s1 x1 x2 x3.(a_topic(x1) & for(x1,x3) & n_competition(x3) & n_practice(x1) & of(x1,x2) & n_group(x2) & a_choir(s1) & Theme(s1,x1))