Question 1
$$6\;7\;8\;9\;9\;8\;7\;9\;7\;7\;8\;9\;7\;8\;7\;6\;9\;6\;8\;9\;7\;7\;9\;8\;9\;7\;6\;6\;8\;7$$
How many such digits are there in the given series each of which when subtracted from the following digit, gives 1 as resultant?

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