Sensium planting-asymmetric pairs 2026: 10 mutual edges the top-25 table under-weights

Grape confusion pairs are not only the Cabernet/Merlot spine. Studies 1a–1d already cut the Sensium catalog four ways — mutual planting rank, planted neighborhoods, one-way exam hubs, and identity traps. Study 1e adds a fifth cut: planting-asymmetric mutual pairs — edges that are mutual (both dossiers list each other) yet sit outside Study 1a’s top 25 because one partner is a top-20 planted hub and the other is mid-catalog.

Headline finding: the default filter returns 10 such pairs. The densest include Cabernet Sauvignon ↔ Cabernet Franc, Merlot ↔ Cabernet Franc, Airén ↔ Verdejo, Bobal ↔ Touriga Nacional / Mencía, Trebbiano Toscano ↔ Garganega, and Pinot Gris ↔ Vermentino / Glera. They are real Compare chips — not one-way warnings — but combined planting rank pushes them below the citation table candidates memorize first.

This is still catalog-graph research, not population miss-rates (Study 2 / topic `137` when volume clears). Companions: 1a pairs · 1b neighborhoods · 1c one-way hubs · 1d identity traps.

Methodology (read this before citing)

What this is not: a claim candidates miss these underdogs most often in live exams. It is a graph-structure finding: mutual + planted still elevates famous↔famous twins; mutual + asymmetric planting elevates famous↔syllabus twins that the top-25 table under-weights.

Why asymmetry deserves its own study

Study 1a answers: which mutual edges does planting elevate globally? Cabernet/Merlot wins because both ranks are tiny. Study 1c answers: which exam hubs are mostly one-way? Nebbiolo wins because Pinot’s four chips are already full. Study 1e answers a third question: which edges are mutual — so the product already teaches both directions — yet still miss the citation table because one partner’s planting rank is mid-pack?

Cabernet Franc is the clearest example. It is mutual with both Cabernet Sauvignon and Merlot. Every serious Bordeaux flight needs the leafy red-currant fork. Combined planting ranks (31 and 32) still sit outside the top 25’s densest Bordeaux/Rhône spine once you walk past Cabernet/Merlot, Cabernet/Syrah, and Merlot/Sangiovese. Candidates who only drill Study 1a’s first page under-train Franc.

The same pattern hits Iberian and Italian whites: Airén and Trebbiano Toscano are high-planted neutrals already in Study 1a; Verdejo and Garganega are the mid-catalog partners that make the neutral lane exam-useful rather than bulk-only.

Google’s 2026 non-commodity bar still applies: dated method, re-run command, clear “not telemetry” label.

The 10 planting-asymmetric pairs

Separators are the catalog’s first editorial cue (trimmed). Open Compare for the full fingerprint.

Bordeaux family (famous red ↔ Franc)

Iberian neutrals + dark reds

Italian / Mediterranean mid-catalog whites

Three takeaways

1. Mutual does not mean “already covered by Study 1a”

If both dossiers list each other, the product teaches the edge from either page. That does not put the pair on the planting-weighted top 25. Schedule asymmetric mutuals as a second page after ranks 1–10 — especially Cabernet Franc and Verdejo.

2. Neutrals need a mid-catalog twin to become exam-useful

Airén and Trebbiano Toscano appear in Study 1a because they are high-planted. Verdejo and Garganega are why you open those neutrals in a tasting paper: herbal fennel acid vs orchard restraint, or pear-almond Soave texture vs neutral high acid. Without the underdog, the famous neutral is only a bulk warning.

3. Asymmetry is the opposite of one-way hubs — drill both

Study 1c hubs are often one-way (hub → famous look-alike). Study 1e pairs are mutual. Drill both directions: Franc from Cabernet and Cabernet from Franc; Verdejo from Airén and Airén from Verdejo. Use Compare after every miss so Mistake Replay owns the underdog.

How to drill in two weeks

1. Week 1 — Bordeaux + Iberian reds (rows 1–2, 4, 7). Cabernet Franc triangle with Cabernet and Merlot; Bobal vs Touriga / Mencía. One bottle or Train focus per day; write the planting-gap line (“famous #1 vs underdog #30”) before aroma poetry.
2. Week 2 — neutrals + Mediterranean whites (rows 3, 5–6, 8–10). Airén/Macabeo ↔ Verdejo; Trebbiano ↔ Garganega; Pinot Gris ↔ Vermentino / Glera. Cross-check place hubs when the underdog is regional (Spanish, Italian, French).

A useful study habit: after finishing Study 1a’s first ten pairs, ask “which mutual underdog did I skip?” If the answer is always “none,” you are training the planting spine only. Add this page’s ten rows as a fixed appendix.

Service note: these edges are already in the product — open the underdog dossier, not only the famous one (home flights; exam shopping). Confirm structure after identity is clear (structure tasting).

How the five Study 1 cuts fit together

Use them as a stack. A month that only drills 1a still fails Cabernet Franc and Verdejo; a month that only drills 1e still fails Cabernet vs Merlot under time. When Study 2 ships, we will test whether asymmetric mutuals are also population miss patterns — until then, cite this page as catalog structure.

What we will publish next (Study 2)

When anonymized Train/Blind wrong-answer volume clears a documented n threshold, Study 2 will publish miss-rates beside Studies 1a–1e. Until then, do not call these “most-missed underdogs.” They are planting-asymmetric mutual edges the editorial graph already stores.

Frequently asked questions

How is this different from one-way exam hubs (Study 1c)?

Study 1c selects hubs by edge direction (mostly one-way). This Study 1e selects mutual edges by planting gap. Overlap is small by design; Cabernet Franc is mutual and asymmetric, while Nebbiolo is one-way-heavy.

Why only ten pairs?

The default filters (famous ≤20, underdog 21–80, gap ≥20, no identity traps) are intentionally tight so the teaching list stays drillable. Widen with `--max-underdog 120` or lower `--min-gap` if you want the longer export.

Can I cite this in a class?

Yes — attribute “Sensium planting-asymmetric pairs, 2026-07-09” and link this URL. Keep the “not telemetry” label.

How do I reproduce the list?

`node scripts/data/export_planting_asymmetric_pairs.mjs`

Open Cabernet Franc vs Cabernet Sauvignon and the Verdejo dossier this week, then force underdog-first sentences in Blind before any aromatic paragraph. Famous partner first is optional — mutual underdog is the Study 1e habit.