A crowd of black people are gathered and one person has a backpack on.
The lone backpacker has just come from class.
Not everyone wearing a backpack has just come from class.
exists e1 e2 s1 s2 x1 x2 x3 x4.(a_on(s2) & Manner(e2,s2) & Theme(e2,x4) & Actor(e2,x3) & v_have(e2) & n_backpack(x4) & n_person(x3) & card_eq_1(x3) & Theme(e1,x1) & v_gather(e1) & of(x1,x2) & n_people(x2) & a_black(s1) & Theme(s1,x2) & n_crowd(x1))
exists e1 s1 s2 x1 x2.(n_backpacker(x1) & a_lone(s1) & Theme(s1,x1) & a_just(s2) & Manner(e1,s2) & from(e1,x2) & n_class(x2) & Actor(e1,x1) & v_come(e1))