Sequence words

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Across
  1. 1. secondly
  2. 6. thirdly 2
  3. 7. in conclusion
  4. 10. thirdly
  5. 11. First of all
Down
  1. 2. secondly 2
  2. 3. firstly 2
  3. 4. firstly
  4. 5. I would add that
  5. 8. Furthermore, moreover
  6. 9. in addition