How Watson learned the trick

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Across
  1. 5. Clothes for formal occasions
  2. 6. A flat, usually square or rectangular, paper container for a letter
  3. 8. A meal eaten in the morning as the first meal of the day
  4. 11. A person whose job is treating people's teeth
  5. 12. A device with a sharp blade for removing hair from the skin’s surface
Down
  1. 1. A deep, long sound showing great pain or unhappiness
  2. 2. To bring your eyebrows together so that lines appear on your face above your eyes, in an expression of anger, disapproval, or worry
  3. 3. A particular way of doing something
  4. 4. To remove hair from the body, especially a man's face
  5. 7. A team sport popular in England, played with a small, hard ball and a bat
  6. 9. Someone who is being taught
  7. 10. Intelligent