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  1. or download this
    /vol/cat,feline
/vol/dog,canine
...
/vol/cat,feline
/vol/amphibian,FROG
/vol/amphibian,FROG
  2. or download this
    9,/vol/elephant,fourfeet
1999,/vol/dolphin,fish
...
2222,/vol/spider,arachnid
5555,/vol/camel,dromedary
3333,/vol/wolf,canine
  3. or download this
    use strict;

...
  
  print "$_\n" for grep {$_} @a{keys %b};
}