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  1. or download this
    my $v = 'DA39A3EE5E6B4B0D3255BFEF95601890AFD80709';
    my $m = 'FFFF804020100804020100804020100804000102';
    ...
    print unpack 'H*', pack 'B*', $rb;
    
    da39804000000804020100800020100004000100
    
  2. or download this
    perl -le"print unpack'H*', pack'B*', 
    unpack('B*',pack'H*','DA39A3EE5E6B4B0D3255BFEF95601890AFD80709') & 
    unpack('B*',pack'H*','FFFF804020100804020100804020100804000102')"
    
    da39804000000804020100800020100004000100