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GMU ANALYTICAL · INDEX PROOF · DR309
4-vs-2 Column Break Check — Analytical Coordinate Proof (DR309)
DR309 pairs 4-vs-2 Column Break Check (Reference column depth 2 vs active column extending to rows 3 and 4) with Analytical Modality (Formal Index Notation): learners verify At Row 3, (k-m,3) is first empty (Blue); at Row 4, both 3 & 4 are empty (Red), master Transition From Rule 2 Case 2b (Row 3 Blue) to Case 2c (Row 4 Red), and eliminate keeping row 4 blue after row 3 already marked the single-row break.
- Drill Reference ID
- DR309
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