A boy is pulling a little boy in a red sled through the snow.
The boy is pulling his dog in the sled.
The boy cannot be pulling another boy and a dog simultaneously
exists e1 s1 s2 x1 x2 x3 x4.(n_snow(x4) & through(e1,x4) & in(e1,x3) & n_sled(x3) & a_red(s2) & Theme(s2,x3) & Theme(e1,x2) & Actor(e1,x1) & v_pull(e1) & n_boy(x2) & a_little(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 x1 x2 x3.(n_sled(x3) & n_dog(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_pull(e1))