A dancing troupe of African American youngsters doing a choreographed move.
A group of African American students are performing a dance.
Just because a dancing troupe are youngsters does not mean they are students or that they are performing a dance.
exists e1 s1 s2 s3 s4 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & n_move(x4) & a_choreographed(s4) & Theme(s4,x4) & (x2 = x3) & n_youngster(x2) & a_american(s3) & Theme(s3,x2) & a_african(s2) & Theme(s2,x2) & n_troupe(x1) & a_dancing(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_dance(x3) & of(x1,x2) & n_student(x2) & a_american(s2) & Theme(s2,x2) & a_african(s1) & Theme(s1,x2) & n_group(x1))