At 23:01 13/01/2014, Brian E Carpenter wrote: >I've posted another couple of items that may be of interest. >https://www.cs.auckland.ac.nz/~brian/ClassifyingLandscape.pdf Thank you. At last something I partly disagree with but I can understand. A good working basis. I have printed the thread and will come back on it. Thx again. jfc