First I want to thank everyone for their help in deciphering Sven's letters and uncovering the secrets of his clues. I couldn't have done it without everyone's help.
People have managed to read Sven's letters and find where he left clues for his dear Inga to find him but I still can't tell if the parted lovers were ever reunited.
I found another letter with a puzzle attached. I am certain that it is what is now known as a Sudoku puzzle but how Sven hid the secret of his location in the puzzle has me baffled once again. I have included a picture of Sven's original letter and a copy of the puzzle along with a list of letter pairs written under the puzzle.
Everyone has been so kind and generous with their help and I hope that you will help me read this confusing clue as to Sven and Inga's saga.

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8
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7
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1
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6
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3
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7
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1
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9
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6
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2
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9
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3
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4
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5
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3
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5
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7
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4
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7
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9
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1
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5
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3
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2
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1
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7
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8
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9
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4
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6
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