Group of teen males picking up garbage.
Some humans picking up trash.
"Males picking up garbage" is a rephrasing of "humans picking up trash".
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 s1 x1 x2 x3.(a_topic(x1) & a_up(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_pick(e1) & n_trash(x3) & (x1 = x2) & n_human(x1))