Word Ways

Article Title

The Postal Union


A. Ross Eckler


In his first column as Kickshaws editor in February 1989, Dave Morice showed how one could construct chains of state names using their postal codes: for example, MaINe contains the bigram IN which stand for Indiana, INDiana contains the bigram ND which stands for North Dakota. Recently, I realized that this is an example of a directed graph which I discussed in another context in " Directed Word Chains (part 1)" in the August 1991 Word Ways.