What follows is a rather long story, for Dojo had much to teach me and he 
taught it slowly. Sometime, Nell, I will teach you everything I learned from 
Dojo; all you need do is ask. But on the third day of my apprenticeship, when I 
still had not learned anything except humility, good manners, and how to sweep 
out the cave, I asked Dojo if he would be interested in playing a game of 
tic-tac-toe. This was a common sport among dinosaurs.
We would scratch it out in the mud. (Many paleontologists have been baffled to 
find tic-tac-toe games littering prehistoric excavations and have chalked it up 
to the local workers they hire to do their digging and hauling.)