Compare: knowing and saying
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      how many meters || feet high Mont-Blanc is;
      how the word “game” is used;
      what a clarinet sounds like.
The person who is amazed that anyone can || Anyone who is amazed that you can || Anyone who wonders how it is possible to know something and not be able to say it thinks perhaps || may be thinking || is thinking possibly of a case like the first. Certainly not of one || a case like the third.