Puzzle
A dragon and knight live on an island. This island has seven poisoned wells, numbered 1 to 7. If you drink from a well, you can only save yourself by drinking from a higher numbered well. Well 7 is located at the top of a high mountain, so only the dragon can reach it. One day they decide that the island isn't big enough for the two of them, and they come up with a plan. Each of them will bring a glass of water for other and other will drink that. After drinking the water knight lives and dragon dies. How this happened?

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