How many 6s are there in the following number sequence which are immediately
preceded by 9 but not immediately followed by 4 ?
5 6 4 3 2 9 6 3 1 6 4 9 6 4 2 1 5 9 6 7 2 1 4 7 4 9 6 4 25 6 4 3 2 9 [6] 3 1 6 4 9 6 4 2 1 5 9 [6] 7 2 1 4 7 4 9 6 4 2
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