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6b f0
$ perl -le " print unpack 'H*', pack 'h*', '6bf'; b60f
$ perl -le " print join ' ', split /(....)/, unpack 'b*', pack 'h*', ' +6bf'; 0110 1101 1111 0000 ... $ perl -le " print join ' ', split /(....)/, unpack 'B*', pack 'h*', ' +6bf'; 1011 0110 0000 1111