A man is skateboarding in front of a group of people.
The man is wearing a backwards baseball cap.
It is not necessary to wear backwards baseball cap while skateboarding
exists e1 x1 x2 x3 x4.(in(e1,x2) & of(x2,x3) & of(x3,x4) & n_people(x4) & n_group(x3) & n_front(x2) & Actor(e1,x1) & v_skateboard(e1) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_cap(x2) & of(x2,x4) & n_baseball(x4) & of(x2,x3) & n_backward(x3))