A little boy and girl riding their bikes down the sidewalk with training wheels on .
It is highly unlikely that a girl and a boy on bikes with training wheels while some older children watch .
It is highly unlikely that a girl and a boy on bikes with training wheels while some older children watch .
There is a better than even chance that a girl and a boy on bikes with training wheels while some older children watch .
A girl and a boy on bikes with training wheels while some older children watch .