A little boy and girl riding their bikes down the sidewalk with training wheels on.
A girl and a boy on bikes with training wheels while some older children watch.
Children can ride bikes without older children watching.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7.(n_sidewalk(x5) & a_topic(s1) & a_on(s3) & Manner(e1,s3) & down(e1,x5) & with(x5,x6) & n_wheel(x6) & of(x6,x7) & n_training(x7) & Theme(e1,x4) & Actor(e1,x3) & v_ride(e1) & n_bike(x4) & of(x4,x1) & n_thing(x1) & (s1 = x3) & n_girl(x2) & n_boy(x1) & subset_of(x2,s1) & subset_of(x1,s1) & a_little(s2) & Theme(s2,s1))
(-x)