I hope it will  be useful to advertise the following free download by Elsevier  https://authors.elsevier.com/a/1WGM64PiHtGJi Following  this link before Feb 10, 2018, will take you to the final version of this invited article for a volume of Indagationes in honor of L.E.J.Brouwer, and also to links for downloading the whole volume. (I should say that Diagram 13 of my article has a typo: the middle horizontal lines should be double only in the middle. ) ---------------------------------------- Best Ronnie [For admin and other information see: http://www.mta.ca/~cat-dist/ ]