The Perfect Kingdom :Can you suggest a better solution?

Question:

Once upon a time there was a king. He wanted to build a new kingdom with 10 beautiful castles. He asked his architect to plan the kingdom so all the castles will be connected by 5 straight walls. Each wall must connect 4 castles together. At least one castle must be protected by castle walls.

King was not happy with the solution since none of his castles were then protected by a wall. Can you suggest a better solution?





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