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             Rate  find_path       solo find_path2  transform
find_path  5.91/s         --       -62%       -75%       -97%
solo       15.7/s       166%         --       -35%       -92%
find_path2 24.1/s       308%        53%         --       -87%
transform   188/s      3084%      1097%       681%         --

  for my $letter ( 'a'..'z' ) {