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Programming Enigma Puzzles
From New Scientist #1819, 2nd May 1992 [link]
In Churchester there are nine churches of the Angel, of the Bell, of Charity, of Destiny, of Endurance, of Friendship, of God, of Help and of Inspiration. The map of Chuchester shows the nine square parishes and each has its church at its centre. I can only remember where the church of the Angel and the church of Charity are:
There are nine doves in Churchester and each one visits three churches, flying around in a triangle in a clockwise direction. For example, one dove flies from Help to Bell, to Charity, and then back to Help again. The routes of the doves are HBC (the one just mentioned), DAF, BGI, GEA, HID, CEF, CAI, BED and FHG.
Complete the map of Churchester.