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based on an earlier version of the Wolfram Language.
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$Aborted

$Aborted
is a special symbol that is returned as the result from a calculation that has been aborted.
$Aborted is returned by a calculation that was aborted:
 
Try a computation with exact arithmetic and fall back to machine arithmetic if it is too slow:
In[1]:=
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In[2]:=
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Out[2]=
In[3]:=
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Out[3]=
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