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There are! One of the most dangerous is forcing you to write the word "doing" in places it makes no sense!

• blooalien 4y ago
  Pretty sure they meant "don't know about" in the phrase you're referring to. Perhaps they were posting from a portable "smart" device and got caught out by the ever so reliable "auto-wrong" system, or maybe they just had a "brain-fart" while typing fast…