A teen performing a bike trick at a skate park.
There is at least one bike at the skate park.
A teen on their bike at the skate park means their single one bike is at the skate park with them.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & at(e1,x5) & n_park(x5) & of(x5,x6) & n_skate(x6) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_trick(x3) & of(x3,x4) & n_bike(x4) & (x1 = x2) & n_teen(x1))
exists p1 x1 x3 x4.(n_park(x3) & of(x3,x4) & n_skate(x4) & exists e1 x2.((x1 = e1) & a_at(e1) & Actor(e1,x2) & v_least(e1) & at(x2,x3) & n_bike(x2) & card_eq_1(x2)))