adults and children ride bikes on a trail.
People are out riding bikes.
People are adults and children.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_ride(e1) & on(x4,x5) & n_trail(x5) & n_bike(x4) & subset_of(x3,x1) & n_child(x3) & subset_of(x2,x1) & n_adult(x2))
exists e1 s1 x1 x2.(a_out(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_people(x1))