code: def check_days(text):
      
      err = "MAU102"
      msg = "Days of the week should be capitalized. '{}' is the preferred form."
  
      list = [
  
          ["Monday",       ["monday"]],
          ["Tuesday",      ["tuesday"]],
          ["Wednesday",    ["wednesday"]],
          ["Thursday",     ["thursday"]],
          ["Friday",       ["friday"]],
          ["Saturday",     ["saturday"]],
          ["Sunday",       ["sunday"]],
      ]
  
      return preferred_forms_check(text, list, err, msg, ignore_case=False)
docs: Suggest the preferred forms.