It's a new year, so perhaps we can finally put an end to rampant incompetence that continues to plague this office. For the last time, do not use permanent markers on the dry erase board. The only time it has ever been acceptable to use permanent markers on the dry erase board, was when I wrote, "DO NOT USE PERMANENT MARKERS" in permanent marker on the dry erase board. My warning could not be any clearer.
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The marker that conveniently says "dry erase marker" on it is the only writing utensil appropriate for the dry erase board. It doesn't take a genius to see the connection between the "dry erase marker" and the "dry erase board." Obviously, dry erase markers don't contain xylene and/or toluene, hence their use on white boards or overhead transparencies and their subsequent inability to be used on porous surfaces. If you can't understand some basic advanced chemistry, maybe you're not cut out to work in the office supplies industry.