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Alicia, Brad, Jack, and Diana each play piano notes from Do to Fa. Use the following clues – which note does Jack play? Enter the solution below.

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Interesting fact:

Materials science has come up with some amazing inventions. Take aluminium oxynitride, often incorrectly referred to as "transparent aluminium": the see-through ceramic is four times tougher than glass, insanely scratch-resistant, and withstands temperatures of up to 1200 °C! It's also prohibitively expensive, starting at $15,000 per square metre.