The Battle of Monkey and the Crab

A long time ago, there lived a monkey and a crab. One day the monkey picked a persimmon seed up off the road, and the crab picked up a rice-ball. Because the rice-ball looked very delicious, the monkey said to the crab. "Hey, Crab, 　I'll give you this persimmon seed for 　that rice-ball, OK?" "Sure, that's fine." Said the kind-hearted crab.