Why is the tortoise shell 13?

There is an interesting legend ~ a long time ago, there was no pattern on the shell of a turtle. Once, the dragon king was ill, and the doctor said that he had to eat the rabbit's heart to get better. So the Dragon King sent a turtle to trick the rabbit into the Dragon Palace. Later, the rabbit found that he was cheated by the tortoise, so he flew up and kicked the tortoise to a stone. Since then, the turtle shell has been split into 13 pieces.

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