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to cast one's pearls before swine
to offer something precious to someone unable to appreciate the value of what is being given
thirty pieces of silver; kiss of betrayal
payment received for an act of treachery; a supposed friend's treachery
Gordian knot; cutting the Gordian knot
any extremely complex problem; solving such a problem in a quick, decisive manner
all that glitters is not gold
something that appears valuable on the outside may in fact be less than valuable
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