A group of guys are standing on a stage playing several different instruments.
A group of guys are all playing saxophones together.
They cannot all be saxophones if they are playing different instruments.
exists e2 e1 s1 x1 x2 x3 x4 x5.(n_instrument(x5) & for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_play(e2) & -(x4 = x5) & n_instrument(x4) & a_several(s1) & Theme(s1,x4) & on(e1,x3) & n_stage(x3) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_guy(x2) & n_group(x1))
exists e1 s1 s2 x1 x2 x3.(a_all(s2) & Manner(e1,s2) & a_together(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_saxophone(x3) & of(x1,x2) & n_guy(x2) & n_group(x1))