an easy crossword

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Across
  1. 3. a word or symbol used for counting
  2. 5. instructor
  3. 8. a part of an organisation
  4. 9. knowledge recieved concerning a particular fact
  5. 10. a measure for time
Down
  1. 1. someone who goes to school
  2. 2. a human being
  3. 4. investigation into a subject
  4. 6. a group of people
  5. 7. a human-like mammal