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MapAll
MapAll[f, expr] or f //@ expr applies f to every subexpression in expr.
Example: MapAll[f,  a,b , c,d ]  .
MapAll[f, expr] is equivalent to Map[f, expr, 0, Infinity ].
MapAll[f, expr, Heads -> True] applies f inside the heads of the parts of expr.
See The Mathematica Book: Section 2.2.4.
See also: ExpandAll, ReplaceAll.
Further Examples
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