Twelve

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Across
  1. 2. in a box
  2. 4. in a foot
  3. 8. herculean tasks
  4. 9. in a bouquet
  5. 11. in a suit
  6. 12. in an octave
Down
  1. 1. in a year
  2. 3. in the zodiac
  3. 5. age in years
  4. 6. in Christmas
  5. 7. on the clock
  6. 10. in a carton