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FilledSmallSquareHoldAll is an attribute which specifies that all arguments to a function are to be maintained in an unevaluated form.

FilledSmallSquare You can use Evaluate to evaluate the arguments of a HoldAll function in a controlled way.

FilledSmallSquare Even when a function has attribute HoldAll, Sequence objects that appear in its arguments are still by default flattened, Unevaluated wrappers are stripped, and upvalues associated with the arguments are used.

FilledSmallSquare See The Mathematica Book: Section 2.5.3 and Section 2.5.5.

FilledSmallSquare See also: Unevaluated, Hold, NHoldAll, HoldAllComplete, SequenceHold, Extract.

Further Examples