Plural of nouns

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Across
  1. 2. man
  2. 6. potato
  3. 8. boy
  4. 9. tomato
  5. 11. child
  6. 12. half
Down
  1. 1. knife
  2. 3. baby
  3. 4. country
  4. 5. box
  5. 7. sandwich
  6. 10. tooth