two guys in street cloths doing some marshal arts.
Two men perform martial arts as part of a defense class.
The men doing martial arts are not necessarily doing them for a defense class.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x5) & Actor(e1,x4) & v_do(e1) & n_art(x5) & a_marshal(s1) & Theme(s1,x5) & (x1 = x4) & in(x1,x2) & n_cloth(x2) & of(x2,x3) & n_street(x3) & n_guy(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3 x4 x5.(as(e1,x3) & of(x3,x4) & n_class(x4) & of(x4,x5) & n_defense(x5) & n_part(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_art(x2) & a_martial(s1) & Theme(s1,x2) & n_man(x1) & card_eq_2(x1))