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"An expert need not give the reasons for \[her or\] his pronouncements \-\- indeed, \[she or\] he is most clearly functioning as an authority when \[she or\] he makes pronouncements without giving reasons, and if \[she or\] he were to communicate \[her or\] his reasons in full at the time, then it would no longer be on \[her or\] his authority that \[her or\] his pronouncements were accepted" (46).