        He was still writing, apparently making marks for thirteen, fourteen, and so on.  She took an extra piece of parchment and wrote down more of her numbers, too.  They were fairly predictable, so she just incremented the dozens column, then the grosses column, finally sliding the paper over to him.  Running a quick mental calculation, she saw that he had done the same thing, although his numbers went to twenty before they became regular.  Looking at his talons, she thought she knew why.  If the pattern of digits was repeated on his hind paws, then he would have twenty to count before he had to increment.  Maybe they were unique because each digit represented a talon or claw?