Once upon a time, a rabbit wanted to cross a river but he could not swim. He had an idea. He saw a boss of crocodile, “How many crocodiles are there in the river?” the boss of crocodile answered, “we are twenty here.” “Where are they?” the boss of crocodile asked.“All of you are good, nice, gentle and kind, so I want to make a line in order. Later I will know how kind you are.” Said the rabbit. Then the boss of crocodile called all friends and asked them to make a line in order from one side to other side of the river. Just then, the rabbit started to count while jumping from one crocodile to another, one…two…three…four… until twenty, and finally, he thanked crocodile because he had crossed river.