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  1. Pfizer says that their vaccine candidate works for children aged 5 and 11.
  2. Pfizer says that their vaccine candidate works for children aged 5 to 11.
  3. Pfizer says that their vaccine candidate works for children aged 5 to 11 years old.
  4. Pfizer says that their vaccine candidate is effective for children between the ages of 5 and 11 years.

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