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At the request of Professor C. A. Meier, the editors would like to draw attention to the authors' names having been quoted in the wrong order in the publication of the above paper which appears in the July 1978 issue (Vol. 23, 3). As M. A. Wozny is the main author and responsible for the statistics, his name should have appeared before that of C. A. Meier, as in the manuscript. Our apologies have been conveyed to the main author.