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  1. or download this
    $\="\n";
$_='Hello World!'; print;
$_=pack'(U)*',map{hex}unpack'(H5)*'; print;
$_=pack'(H5)*',map{sprintf"%05X",$_}unpack'(U)*'; print;
  2. or download this
    $\="\n";
$_='Hello World!'; print;
$_=pack'(U)*',map{hex}unpack'(H4)*'; print;
$_=pack'(H4)*',map{sprintf"%04X",$_}unpack'(U)*'; print;
  3. or download this
    $\="\n";
$_='Hello World!'; print;
$_=pack'(U)*',map{hex}unpack'(H4)*'; print;
$_=pack'n*',unpack'(U)*'; print