ANSWERS: 1
  • In number one, the phrase "at least" is used to acknowledge that yes, it's true that the sign writers may make some mistakes, but "at least", which would mean "at the very least" they are writing about things that matter. The speaker is implying that there may be other sign writers who may have no mistakes, but they also are writing things that either have nothing to do with the situation or that it's boring and outdated. In number two, at least is used to instruct the reader regardless of what they write, they may not use words having less than 4 letters, but the words can be as long as they like. And the second part reminds you that you will have to be creative as not only are you only allowed to use words with 4 or more letters, none of the words may have the same letter in it twice.

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