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#!perl -lw
$x = "\x55\xAA\x55\xAA";;
substr( $x, $_, 1 ) = chr( ord( substr( $x, $_, 1 )) << 1 ) for 0 .. 3
+;;
...
Character in 'b' format wrapped in unpack at - line 7.
Character in 'b' format wrapped in unpack at - line 7.
01010101001010100101010100101010

$ perl
#!perl -lw
$x = "\x55\xAA\x55\xAA";;
...
0100001101010101101000110010100101000011010101011010001100101001
1100001101000001010000110101010111000011101000010100001100101001110000
+1101000001010000110101010111000011101000010100001100101001
0100001101010101101000110010100101000011010101011010001100101001