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Across
  1. 2. Efficiency can never be unity
  2. 4. Pressure, but chemical engineers hate us
  3. 6. We control the oil bill
  4. 7. Immunity, but we are the same
  5. 9. The best guys out there
Down
  1. 1. I am your heart
  2. 3. R22, R134a we are pretty chill
  3. 5. Distil till death do us apart
  4. 8. continuous' unpopular cousin