Three street performers, showing off their extraordinary instruments.
A mariachi band was playing on the street corner.
Not all street performers are in a mariachi band, and the fact that three street performers are showing off their instruments does not indicate that they were playing on the street corner.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & a_off(s2) & Manner(e1,s2) & Theme(e1,x4) & Actor(e1,x3) & v_show(e1) & n_instrument(x4) & a_extraordinary(s1) & Theme(s1,x4) & of(x4,x1) & n_thing(x1) & (x1 = x3) & n_performer(x1) & of(x1,x2) & n_street(x2) & card_eq_3(x1))
exists e1 x1 x2 x3 x4.(n_corner(x3) & of(x3,x4) & n_street(x4) & on(e1,x3) & Actor(e1,x1) & v_play(e1) & n_band(x1) & of(x1,x2) & n_mariachus(x2))