Fill in the crossword puzzle

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Across
  1. 3. the study of coins
  2. 4. royal commands issued by rulers and kings
  3. 6. the period of history before written records
  4. 7. the period from when writing was introduced
Down
  1. 1. the study of the past through material remains
  2. 2. people who study the past and tell others about it
  3. 5. the study of old inscriptions or epigraphs