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