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  1. or download this
    perl -e '$_=sprintf("%d",pack "H*",b).unpack "H*",b;m/\d$/;$b=$&;m/^\d
+/;print "$b$&$&$b$/"'

...
perl -e '$a=@{[a,b]};$b=@{[]}; print "$a$b$b$a$/"'

perl -e '($a=$%)++;print ++$a,$%,$%,$a,$/'
  2. or download this
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