A performing arts group participate in a small parade.
A performing arts group are not in the parade
One can either participate in the parade or not be in the parade, but cannot do both.
exists e1 e2 s1 x1 x2 x3.(in(e2,x3) & n_parade(x3) & a_small(s1) & Theme(s1,x3) & Actor(e2,x1) & v_participate(e2) & n_group(x1) & of(x1,x2) & n_art(x2) & Actor(e1,x1) & v_perform(e1))
exists e1 x1 x2 x3.(n_parade(x3) & -exists p1.in(x1,x3) & n_group(x1) & of(x1,x2) & n_art(x2) & Actor(e1,x1) & v_perform(e1))