What is a hidden pair in Sudoku?

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Tags

  1. #house
  2. #buried
  3. #column
  4. #pairs
  5. #pencil
  6. #cells
  7. #block
  8. #exactly
  9. #basically
  10. #appear
  11. #occurs
  12. #naked
  13. #hidden
  14. #within
  15. #marks