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The site had the following in the homepage, "TWINSPAN is perhaps one of the most popular clustering methods at least among vegetation ecologists, which is not implemented in R." I noticed that the web site stated " R-sig-eco forum has several posts." They also stated " Recently, I got a simple idea, how to make TWINSPAN work in R, and how to extend this implementation also for modified TWINSPAN. The way I used is somewhat clumsy, but it seems to work. File, which is an executable program based on original FORTRAN library written by Mark O. Hill author of the algo."