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  1. or download this
    $ perl -mstrict=vars -le 'print $x**$y;'
Global symbol "$x" requires explicit package...
  2. or download this
    $ perl -x
#!perl -wl -Mstrict -MB -MCGI
Argument "MCGI" isn't numeric in subtraction (-).
Argument "-MB" isn't numeric in subtraction (-).