WordPlay

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Across
  1. 2. one of William Wordsworth's famous poems
  2. 5. First AI robot
  3. 7. country with the world's youngest population
  4. 8. Ted Hughes' wife that wrote as well
  5. 9. Headquarters of Facebook
Down
  1. 1. longest word in the English dictionary with only one vowel
  2. 3. European Union country
  3. 4. largest country without rivers
  4. 6. 85th element in the periodic table