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  1. or download this
    [paul@paul-laptop nqp]$ perl -we '$x = 1'
Name "main::x" used only once: possible typo at -e line 1.
  2. or download this
    my $value = $SOME_PKG::SOME_VAL
   || $SOME_PKG::SOME_VAL; # warn clean
  3. or download this
    use warnings qw(single_use_vars);