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  1. or download this
    # note that I used {} as the delimiter for tr///
    $foo =~ tr{1234567890!@#$%^&*()-+=\\|~}
              {?/><:;[]{}poidjhgk5329%c1^};
    
  2. or download this
    $"=$,,$_=q>|\p4<6 8p<M/_|<('=>
    .q>.<4-KI<l|2$<6%s!<qn#F<>;$,
    .=pack'N*',"@{[unpack'C*',$_]
    }"for split/</;$_=$,,y[A-Z a-z]
             {}cd;print lc