Group of teen males picking up garbage.
Teens are working on a project to clean up the park.
A group of teen males can be picking up garbage even if they are not working on a project. Garbage can be picked up from anywhere and not just to clean up a park.
exists e1 s1 s2 s3 x1 x2 x3.(ne_org_group(s1) & a_topic(s1) & of(s1,x1) & a_up(s3) & Manner(e1,s3) & Theme(e1,x3) & Actor(e1,x2) & v_pick(e1) & n_garbage(x3) & (x1 = x2) & n_male(x1) & a_teen(s2) & Theme(s2,x1))
exists e1 p1 x1 x2 x3.(n_park(x3) & on(e1,x2) & Topic(x2,p1) & exists e2 s1.(a_up(s1) & Manner(e2,s1) & Theme(e2,x3) & Actor(e2,x2) & v_clean(e2)) & n_project(x2) & Actor(e1,x1) & v_work(e1) & n_teens(x1))