How many 7's are there in the following series which are not immediately fol-
lowed by 3 but immediately preceded by 8 ?
8 9 8 7 6 2 2 6 3 2 6 9 7 3 2 8 7 2 7 7 8 7 3 7 7 9 4
8 9 8 [7] 6 2 2 6 3 2 6 9 7 3 2 8 [7] 2 7 7 8 7 7 7 9 4
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