Mathematics

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Across
  1. 2. What is the predisessor of 9000
  2. 3. Four thousand seventy in figures ?
  3. 4. What is the successor of 1999 ?
Down
  1. 1. What is the predisessor of 3002 ?
  2. 2. What is the successor of 7999 ?
  3. 4. What is the predisessor of 2004