The white truck is stuck on the large rocks.
A blue truck is being towed.
White and blue are different colors.
exists e1 s1 s2 x1 x2.(n_rock(x2) & a_large(s2) & Theme(s2,x2) & n_truck(x1) & a_white(s1) & Theme(s1,x1) & on(e1,x2) & Theme(e1,x1) & v_stick(e1))
exists e1 s1 x1.(Theme(e1,x1) & v_tow(e1) & n_truck(x1) & a_blue(s1) & Theme(s1,x1))