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The following table represents addition of two six-digit numbers given in the first and the second rows, while sum is given in the third row. In the representation, each of the digits $0,1,2,3,4,5,6,7,8,9$ has been coded with one letter among A,B,C,D,E,F,G,H,I,J,K, with distinct letters representing distinct digits.

      B    H    A   A   G F
  +     A    H    J   F   K F
    A   A    F   G  C   A F

 

Which among the digits $3,4,6$ and $7$ cannot be represented by the letter D _________

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