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ReleaseHold
 ReleaseHold[expr] removes Hold, HoldForm, HoldPattern and HoldComplete in expr.
Example: ReleaseHold[ 2, Hold[1 + 1] ]   .
ReleaseHold removes only one layer of Hold etc.; it does not remove inner occurrences in nested Hold etc. functions.
See The Mathematica Book: Section 2.5.5.
See also: Evaluate.
Further Examples
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