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  1. or download this
      my $h = unpack( 'H*', $bitstring ) ;
  2. or download this
      my $h = unpack( 'H*', scalar reverse $bitstring ) ;
  3. or download this
      my $h = unpack( 'H*', pack('b*', unpack('B*', $bitstring)) ) ;
  4. or download this
      my $h = unpack( 'H*', pack('b*', unpack('B*', scalar reverse $bitstr
+ing)) ) ;