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The Nun's Puzzle

As there are eighteen cards bearing the letters "CANTERBURY PILGRIMS," write the numbers 1 to 18 in a circle, as shown in the diagram. 

Then write the first letter C against 1, and each successive letter against the second number that happens to be vacant. 

This has been done as far as the second R. 
If the reader completes the process by placing Y against 2, P against 6, I against 10, and so on, he will get the letters all placed in the following order:—CYASNPTREIRMBLUIRG, which is the required arrangement for the cards, C being at the top of the pack and G at the bottom.

Medieval Brain Teasers