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Published online by Cambridge University Press: 17 April 2009
The author has noticed two small errors in his paper [1]: In Figure 1 on p. 290, the vertices labelled 4n, 4n + 1, 4n + 2 should be labelled 4n − 1, 4n, 4n + 1, respectively. In the 14th line on p. 291, “at a distance greater than 2n − 1” should read “at a distance greater than 2n − 2”.