A boy in a blue hat is riding a green sledge on the snow at dusk.
The boy is wearing a red hat.
One can either be wearing a blue hat or a red hat.
exists e1 s1 s2 x1 x2 x3 x4 x5.(n_snow(x4) & at(e1,x5) & n_dusk(x5) & on(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_sledge(x3) & a_green(s2) & Theme(s2,x3) & in(x1,x2) & n_hat(x2) & a_blue(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 s1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_hat(x2) & a_red(s1) & Theme(s1,x2))