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RSI stands for Repetitive Strain Injury – a medical condition you have a significant risk of getting from typewriting, in particular from bad practice of typewriting. Further information can be found on the web, see for instance, http://eeshop.unl.edu/rsi.html, http://www.tifaq.org/, http://www.rsi.deas.harvard.edu/, http://www.rsihelp.com/, and http://www.rsi-uk.org.uk/.
