Two art students are making something out of clay.
The students are playing dart.
Students making something out of clay could not have been playing dart.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x3) & Actor(e1,x1) & v_make(e1) & of(x4,x5) & n_clay(x5) & out(x3,x4) & n_thing(x4) & n_thing(x3) & n_student(x1) & of(x1,x2) & n_art(x2) & card_eq_2(x1))
exists e1 x1 x2.(n_student(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dart(x2))