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The Underground Maze

The only way out of the yard that I now was in was to descend a few stairs that led up into the centre (A) of an underground maze, through the winding of which I must pass before I could take my leave by the door (B). 
But I knew full well that in the great darkness of this dreadful place I might well wander for hours and yet return to the place from which I set out. 
How was I then to reach the door with certainty? 

With a plan of the maze it is but a simple matter to trace out the route, but how was the way to be found in the place itself in utter darkness?





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