A man skateboarding in front of graffiti.
A man is riding a bicycle at the beach.
riding a bicycle is not the same as skateboarding
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & of(x3,x4) & n_graffitus(x4) & n_front(x3) & Actor(e1,x2) & v_skateboard(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(n_beach(x3) & at(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x2) & n_man(x1))