A group of gymnasts performing.
The gymnasts are practicing in private
The gymnasts cannot be performing and practicing at the same time.
exists e1 x1 x2 x3.(a_topic(x1) & Actor(e1,x3) & v_perform(e1) & (x1 = x3) & of(x1,x2) & n_gymnast(x2) & n_group(x1))
exists e1 s1 x1.(n_gymnast(x1) & in(e1,s1) & Theme(s1,x1) & a_private(s1) & Actor(e1,x1) & v_practice(e1))