Cheerleaders are practicing pyramid routines.
People practicing
The people that are practicing are cheeleaders.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_routine(x2) & a_pyramid(s1) & Theme(s1,x2) & n_cheerleader(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_practice(e1) & (x1 = x2) & n_people(x1))