Some fonts only have characters available for the letters, but nothing to represent the punctuation marks. When this is the case, you will just see a rectangular box, and you need to know this WILL be printed. If you do not want this box to appear, then delete the character, or you could try a different font. There are so many fonts to choose from, you are almost certain to find another that you like.
Typically well-known fonts (such as the default) include the full character set.
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