Cheerleaders are practicing pyramid routines.
Some girls are trying to dance
Cheerleaders are practicing pyramid routines does not necessary that some girls are trying to dance
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 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2.(Actor(e2,x1) & v_dance(e2)) & n_girl(x1))