People are walking in the park.
One man skates.
either they are walking or skating
exists e1 x1 x2.(n_park(x2) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1.(Actor(e1,x1) & v_skate(e1) & n_man(x1) & card_eq_1(x1))