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  1. or download this
    $ perl -E '
    say for (
    ...
    a\\\b
    a\\\\b
    $
    
  2. or download this
    $ perl -E '
    > @arr = map { q{A} . do { chr 0x5c } x $_ . q{B} } 1 .. 4;
    ...
    A\\\B
    A\\\\B
    $