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.
Farrell, Jeremiah, "A Special Tribute to Martin Gardner" G4G12 Exchange Book / (2016): 39-42.
Available at https://digitalcommons.butler.edu/facsch_papers/1014