Two boys, two girls, strapped in and ready for an amusement park ride.
There are four children walking.
One cannot be walking and strapped in simultaneously.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & rel(x1,x2) & for(e2,s2) & for(s2,x5) & n_ride(x5) & of(x5,x7) & n_park(x7) & of(x5,x6) & n_amusement(x6) & Theme(s2,x4) & a_ready(s2) & Theme(e2,x4) & v_strap(e2) & (x2 = x4) & a_in(s1) & Manner(e1,s1) & Theme(e1,x3) & v_strap(e1) & (x2 = x3) & n_girl(x2) & card_eq_2(x2) & n_boy(x1) & card_eq_2(x1))
exists p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_walk(e1) & (x2 = x3) & n_child(x2) & card_eq_4(x2))