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Check[expr, failexpr]
evaluates expr, and returns the result, unless messages were generated, in which case it evaluates and returns failexpr.
Check[expr, failexpr, {s1::t1, s2::t2, ...}]
checks only for the specified messages.
  • Check does not test for messages that have been switched off using Off, or by uses of Quiet that occur inside it.
  • The operation of Check is not affected by being enclosed inside Quiet.
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