A boy in blue and white on rollerskates holds hockey stick with a black ball at the end of it.
The boy is riding on ice skates.
The boy on rollerskates that holds hockey stick cannot be the one riding on ice skates.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8.(n_end(x8) & with(e1,x7) & at(x7,x8) & of(x8,x1) & n_thing(x1) & n_ball(x7) & a_black(s2) & Theme(s2,x7) & Theme(e1,x6) & Actor(e1,x1) & v_hold(e1) & n_stick(x6) & a_hockey(s1) & Theme(s1,x6) & on(x1,x5) & n_rollerskate(x5) & in(x1,x2) & n_white(x4) & n_blue(x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_boy(x1))
exists e1 x1 x2 x3.(n_boy(x1) & on(e1,x2) & n_skate(x2) & of(x2,x3) & n_ice(x3) & Actor(e1,x1) & v_ride(e1))