Technology

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Across
  1. 4. a small machine we sometimes use in maths
  2. 6. discover
  3. 7. a square box
Down
  1. 1. a small thing that produces electricity
  2. 2. a telephone you can take with you
  3. 3. extremely clever person
  4. 4. a very big town
  5. 5. a tall building