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In the section headed "Discussion", a printing error resulted in a loss of sense which misrepresented the author's intended meaning. We apologise for any inconvenience this may have caused and reproduced below is a corrected version of the first two paragraphs of that section. DISCUSSION Looking at the results for the adapted 3-optimal and Christofides algorithms, we have that in nine of the 22 problems they give the same result; in five of the 22 problems the adapted 3-optimal procedure givesdoi:10.2307/2581930 fatcat:uy57bpvsw5derlltc7ohjn6ex4