Four musicians playing music in a group on the sidewalk.
The four musicians are preparing musical equipment to play music for an audience.
one group is playing while the other is preparing
exists e1 x1 x2 x3 x4 x5.(n_sidewalk(x5) & a_topic(x1) & on(e1,x5) & in(e1,x4) & n_group(x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_music(x3) & (x1 = x2) & n_musician(x1) & card_eq_4(x1))
exists e1 p1 s1 x1 x2.(n_musician(x1) & card_eq_4(x1) & Topic(e1,p1) & exists e2 x3 x4.(for(e2,x4) & n_audience(x4) & Theme(e2,x3) & Actor(e2,x1) & v_play(e2) & n_music(x3)) & Theme(e1,x2) & Actor(e1,x1) & v_prepare(e1) & n_equipment(x2) & a_musical(s1) & Theme(s1,x2))