"Oct"

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Across
  1. 2. A group of eight singers or musicians performing together
  2. 4. Using a system of numbers that uses only the numbers 0 to 7
  3. 5. A month between November and Sempember
Down
  1. 1. Having eight straight sides
  2. 3. The distance between two musical notes that are eight notes apart
  3. 6. A solid shape whose eight sides are triangles of equal size