A lack dog and a brown and white dog run on a gravel surface with something red underfoot.
Dogs are chasing a ball.
Dogs that run on a surface with something red underfoot are not necessarily chasing a ball.
exists s1 s2 s3 s4 x1 x2 x3 x4 x5 x6 x7 x8 x9.(a_topic(s1) & subset_of(x3,s1) & on(x3,x5) & with(x5,x7) & Time(x7,x9) & n_underfoot(x9) & Theme(s4,x8) & a_red(s4) & (x7 = x8) & n_thing(x7) & n_surface(x5) & of(x5,x6) & n_gravel(x6) & n_run(x3) & of(x3,x4) & n_dog(x4) & a_white(s3) & Theme(s3,x3) & a_brown(s2) & Theme(s2,x3) & subset_of(x1,s1) & n_dog(x1) & of(x1,x2) & n_lack(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_ball(x2) & n_dog(x1))