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Adds (cotagged P T1 T2) — P has both T1 and T2 with T1 != T2 — and (tag-pair-count T1 T2 N) which counts posts cotagged with each distinct (T1, T2) pair. Demonstrates count aggregation against a recursive-then-aggregated stream of derived tuples. 2 new demo tests: cooking + vegetarian co-occurrence on a small data set, and a count-of-co-occurrences query.