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    [0] Perl> print unpack 'B8', chr(65);;
01000001

[0] Perl> print unpack 'b8', chr(65);;
10000010
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    ## spacing and annotation added manually...

...
[0] Perl> print unpack 'B*', "\x12\x34";;
0001 0010 0011 0100
   1    2    3    4