. Characteristics of difficult problems

Difficult problems typically exhibit several characteristics, including _____ _____ ________ ___ ______ __________ _____ ___ ______ ______ _____.
______ _________ _____ ______ ______ _________ ______ ________.
_______ ________ __________ ________ __________ ______ _________ ________ _______ __________ _________.
_____ _______ ______ _____ ___ ______ _________ ________.
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