impossible

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Across
  1. 5. middle row of a common keyboard
  2. 7. alphabet backwards
Down
  1. 1. the alphabet
  2. 2. common keyboard from left to right, top to bottom
  3. 3. common keyboard from bottom to top, right to left
  4. 4. the top row of a common keyboard
  5. 6. bottom row of a common keyboard