Two skateboarders walking down a sidewalk in front of many parking signs.
Two skateboarders are riding their boards down the street performing tricks
A skateboarder cannot be walking and riding their board at the same time.
exists e1 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(e1,x4) & of(x4,x5) & n_sign(x5) & of(x5,x6) & n_parking(x6) & n_quantity(x5) & n_front(x4) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & n_sidewalk(x3) & (x1 = x2) & n_skateboarder(x1) & card_eq_2(x1))
exists e2 e1 x1 x2 x3 x4.(n_trick(x3) & Actor(e2,x3) & v_perform(e2) & of(x3,x4) & n_street(x4) & down(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_board(x2) & of(x2,x1) & n_thing(x1) & n_skateboarder(x1) & card_eq_2(x1))