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 $ perl -le " print join q/ /, unpack q/(A4)*/, unpack q/B*/, pack q/B
+33/, 1, 66 "
1000 0000 0000 0000 0000 0000 0000 0000 0000 0000

$ perl -le " print join q/ /, unpack q/(A2)*/, unpack q/H*/, pack q/B3
+3/, 1,66  "
80 00 00 00 00

$ perl -le " print join q/ /, unpack q/(A2)*/, unpack q/H*/, pack q/B3
+3/, join q//, 1, unpack q/B32/, 66  "
9b 1b 00 00 00
...

$ perl -le " print join q/ /, unpack q/(A4)*/, unpack q/B*/, pack q/B3
+3/, join q//, unpack(q/B1/,1), unpack q/B32/, 66 "
1001 1011 0001 1011 0000 0000 0000 0000 0000 0000

$ perl -le " print join q/ /, unpack q/(A4)*/, unpack q/B*/, pack q/B3
+3/, join q//, unpack(q/B1/,1), unpack q/B32/, 66 "

0001 1011 0001 1011 0000 0000 0000 0000 0000 0000