How do I implement this sliding window verb 'f'? Where is this kind of
function described in the J documentation? Search keywords?

2 f 3 5 6 3 8 5 3 7

3 5

5 6

6 3

3 8

5 3

3 7


3 f 3 5 6 3 8 5 3 7

3 5 6

5 6 3

6 3 8

3 8 5

8 5 3

5 3 7

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