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# Tye + Juerd in id=204874
sub slurp {  local( *ARGV, $/ ); @ARGV = shift; <> };

# slurp a bunch of files
@files = do { local(@ARGV, $/) = @filenames; <> };

# get the indexes of items in an array
@foo{ @foo } = 0 .. $#foo;
...
  $i++ while $_[$i] ne $target;
  return $i==$#_ ? undef : $i
}