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    # Encode
    perl -le 'print join " ", map {ord pack "H2", $_} shift =~ /../g' 
+num
...
    perl -le 'print map {int($_/16).($_%16)} @ARGV' num1 num2 ...

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    # Encode

...

    $ perl -le 'print unpack "H*", pack "C*", @ARGV' 1 151 116
    019774