Amisha's amazing crossword

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Across
  1. 4. move in maths
  2. 5. point where two systems, subjects, organizations meet
  3. 7. be found in a newspaper
  4. 8. or get involved with someone
  5. 9. something
Down
  1. 1. underwater vehicle
  2. 2. enter something
  3. 3. into water
  4. 6. existing between nations
  5. 7. into something