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  1. or download this
    $ perl -MO=Deparse -e 'print -"asdf"'
print '-asdf';
-e syntax OK
  2. or download this
    $ perl -MO=Deparse -e 'print -"1asdf"'
print -1;
-e syntax OK
  3. or download this
    $ perl -MO=Deparse -e 'print -"-1asdf"'
print '+1asdf';
...
$ perl -MO=Deparse -e 'print -"+1asdf"'
print '-1asdf';
-e syntax OK