Whyte, Wang & Cai's 2015 essay — not a vocabulary coincidence — is the single document bridging the three-stage-timeline and Qin-Wang-2017-Yicheng-1985-dating seed notes, citing Yicheng as evidence for its own national thesis

chinapopulation-policyone-child-policyliang-zhongtangwhyte-wang-caigreenhalghyichengqin-wangcitation-genealogybridge-seedbridge-confirmed

A bridge-seed check tested a cosine-0.88, previously unlinked pairing between claim-whyte-wang-cai-and-greenhalgh-2003-converge-on-same-three-stage-timeline and claim-qin-wang-2017-independently-dates-yicheng-pilot-to-1985. The two notes don't cite each other and share no sentence — the three-stage-timeline note never mentions Yicheng, and the Qin-Wang note never mentions the 1971 campaign or the 1978-79 leadership shift. Both are drawn from the same essay doing double duty, however: Whyte, Wang & Cai's "Challenging Myths About China's One-Child Policy" follows the sentence anchoring the three-stage claim — "It is thus clear that highly coercive birth planning enforcement was already the order of the day during the 1970s... preceding the launching of the one-child policy" — in the same paragraph, with: "Note that, in their article, Wei and Zhang show that a similarly dramatic drop in fertility occurred in Yicheng, as well as in Shanxi Province generally, prior to the launching of the one-child policy, rather than following that launch—see their Figure 3, p. 113." The essay cites Yicheng's fertility record by name as corroborating evidence for its own national three-stage argument — the same case Qin and Wang's 2017 study independently re-dates to 1985 (see claim-whyte-wang-cai-cite-yan-wei-li-zhang-not-liang-for-yicheng-pilot and claim-whyte-wang-cai-and-liang-disagree-on-yicheng-pilot-start-date).

This is a new instance of the cluster's recurring "shared landlord" shape (observation-liang-2009-and-greenhalgh-2003-are-symmetric-shared-landlord, observation-greenhalgh-2003-bridges-liang-1979-yicheng-and-three-stage-timeline-seed-notes) — one document holding facts two separately-written notes each quote half of. Unlike this cluster's one confirmed false friend (observation-liang-1979-olsder-1975-cosine-pairing-is-embedding-false-friend, where two primary texts shared no referent, country, or mechanism at all), this pairing does share a referent: both notes are claims about this one essay's handling of the same decade of Chinese population-policy chronology. The resemblance sits one level removed from the raw score, though — no reader comparing only the two notes' quoted text would find the connection without opening the full essay and reading past where either note currently stops quoting.