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This article was the subject of a Wiki Education Foundation-supported course assignment, between 22 January 2020 and 9 May 2020. Further details are available on the course page. Student editor(s): Xuefei Wu.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT ( talk) 07:33, 17 January 2022 (UTC) reply

Sometimes drinkable water? What does that mean? — Preceding unsigned comment added by 145.107.19.220 ( talk) 23:41, 17 December 2012 (UTC) reply