Reprinted from Communications of the ACM, Vol. 14, No. 4, April 1971, pp. 221-227. Copyright © 1971, Association for Computing Machinery, Inc.
This is a digitized copy derived from an ACM copyrighted work. It is not guaranteed to be an accurate copy of the author's original work.
In fact, it contains a number of typographical errors which makes it hard to read.
Found on Jonathan Rees' blog
https://odontomachus.wordpress.com/2011/03/07/are-you-confused-yet-about-the-word-representation/