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=Rating Calibration=
In the beginning a lot of calibrations were done to match human ratings <ref>[https://web.archive.org/web/20180713223218/http://privat.bahnhof.se/wb432434/historik.htm PLY/SSDF – the story]([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine], July 2018)</ref> :
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