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sub find_eye_shapes {
  my @key = map( [ split/\s+OR\s+/ ], @_);
...
  }
  return @ret;
}

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# Get all shapes with keywords: face AND person AND perlhacker
my @faces = find_eye_shapes('face', 'person', 'perlhacker');

# Get all shapes with keywords: face AND (person OR animal)
my @faces = find_eye_shapes('face', 'person OR animal');