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CellEvaluationDuplicate

CellEvaluationDuplicate
is an option for Cell which specifies whether the front end should make a copy of the cell before performing any evaluation of its contents that you request.
Create an input cell with CellEvaluationDuplicate set to True:
In[1]:=
Click for copyable input
In[2]:=
Click for copyable input
Select Join[{a, b}, {c, d}] and use EvaluationEvaluate in Place to create a new cell:
In[3]:=
Click for copyable input
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