Parts of the body

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Across
  1. 2. You have to use this for thinking.
  2. 4. Between hand and the arm.
  3. 6. Without this, you can't live.
  4. 8. A bone which is the middle of the leg
Down
  1. 1. Humans have 20 of them.
  2. 3. A part which is around the body
  3. 5. One of the parts of the finger.
  4. 7. Separates the leg with your foot