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  1. or download this
    
% perl -wle '$x = "1e-149"; print $x + "2e-149"'           
...
3e-149
% perl -wle '$hash{ x } = "1e-149"; print $hash{ x } + "2e-36"' 
2e-36
  2. or download this
    % perl -wle 'print( "x" + "y" )'
Argument "y" isn't numeric in addition (+) at -e line 1.
Argument "x" isn't numeric in addition (+) at -e line 1.
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