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https://www.math.uni-bielefeld.de/~sillke/PUZZLES/ALPHAMETIC/alphametic-mike-keith.html https://www.math.uni-bielefeld.de/~sillke/PUZZLES/ALPHAMETIC/ http://bach.istc.kobe-u.ac.jp/llp/crypt.html http://www.tkcs-collins.com/truman/alphamet/alphamet.shtml https://web.math.sinica.edu.tw/math_media/d234/23403.pdf http://goodprimes.eu5.org/GSum.htm http://www.yottkp.edu.hk/CustomPage/43/17leaf.pdf http://www2.kuas.edu.tw/prof/cjh/2003puzzle/subject/index13.htm http://www.primepuzzle.com/leeslatest/alphameticpuzzles.html http://www.contestcen.com/rithms.htm http://www.contestcen.com/index.htm https://www.math.ubc.ca/~israel/applet/metic/metic.html http://cryptarithms.awardspace.us/links.html http://colin.barker.pagesperso-orange.fr/crypta.htm#Index http://rsd2-alert-durden-connections.weebly.com/cryptarithms.html http://www.cross-plus-a.com/help.htm https://www.crsd.org/Page/46263 http://udel.edu/~tomkeane/sendmoremoney.html http://cryptarithms.awardspace.