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G4G12 Exchange Book

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There are exactly 12 different letters in the phrase GATHERING FOR MARTIN GARDNER. We use each of the 12 letters three times each in 18 different two-letter words that are to be placed on the nodes of the graph so adjoining nodes have a letter in common.


This is an electronic copy of a paper originally appearing in the G4G12 Exchange Book. Archived with permission. The authors reserve all rights.


In the spirit of Martin Gardner, who believed in inclusiveness and the sharing of knowledge and curiosity, and as a non-profit that benefits from the generosity of our community, G4G is pleased to give back to the world by making the G4Gn Gift Exchange Books available for download online.

However, these papers are a compilation of original material and the contributors retail their copyrights. No part of the Gift Exchange Books may be reproduced or distributed in any form, without the prior written permission of the original author.