@@ -3,15 +3,17 @@
 **Status:** TEST-PINNED (in PR, branch `claude/eager-albattani-iufugq`). **Basis:** `ADR-2026-10-20-SIX` §2 (`entries/2026-10-20-six-decisions.md`).
 
 - **Moved:** relalg's rewrite rules to `lance_graph_contract::set_algebra::normalize`, unchanged except absorption. relalg's `normalize` converts `Rel` ↔ `SetExpr` (`Plane(i)` ↔ `Sym(i)`, `Atom` ↔ `Res`) and delegates. `symbolic`, `run`, lowering and the public API are unchanged. The contract stays dependency-free.
-- **Absorption** is matched against flattened sibling sets, removing one child at a time against the children still kept. That closes N17 (`ISS-RELALG-ABSORPTION-AFTER-DE-MORGAN`).
-- **`Runs`:** sorted, disjoint, half-open intervals with `∩ ∪ ∖`. `complement(universe)` refuses a set that reaches past the universe.
+- **Absorption** is matched against flattened sibling sets, removing one child at a time against the children still kept, in two forms: (1) a member of the dual child is a sibling, or a junction of siblings; (2) a sibling junction's members all occur in the dual child (`x ∨ (x ∧ y)` with `x` itself a conjunction). That closes N17 (`ISS-RELALG-ABSORPTION-AFTER-DE-MORGAN`) for `x` a leaf, an `And` or an `Or`. Form 2 was found by crepe-plan-probe's N17 pin (CI `probe`), which this PR flips to assert the reduction.
+- **`Runs`:** sorted, disjoint, half-open intervals with `∩ ∪ ∖`, each one merge pass, O(n + m). `complement(universe)` refuses a set that reaches past the universe.
 - **Regression:** the 16 pre-existing relalg tests pass unchanged. 3 tests are new: `conversion_round_trips` plus 2 in `tests/absorption_n17.rs`.
 - **Disable runs** (commands: `cargo test --manifest-path crates/lance-graph-relalg/Cargo.toml --no-fail-fast` and `cargo test -p lance-graph-contract --lib set_algebra`):
 
   | probe | what breaks |
   |---|---|
   | contract `normalize` returns its input | 10 of 14 `rewrites.rs` tests, and both N17 tests in relalg |
-  | generalized absorption off | only the N17 tests: one in relalg, two in the contract |
+  | absorption form 1 off | only the N17 tests: one in relalg, two in the contract |
+  | absorption form 2 off | only `absorption_of_a_superset_conjunction` |
+  | `max` dropped in the `union` merge | `runs_obey_the_set_laws_against_bitsets` |
   | absorption on a partial cover (`all` → `any`) | the silence twin, and the bitset differential (an unsound rule) |
 
 - **Scope held:** no joins, gathers, positional addressing, recursion, D-MPS-8 or `graph_hop`. Measures (`Count`/`Sum` on `Runs`) are not in this PR.
 
@@ -25,7 +25,7 @@ index row, (3) no duplicate entry id. Checks 1 and 2 are deliberately
 opposite directions; the stranding this convention prevents shows up in
 exactly one of them, never both.
 
-396 entries, 2026-08-06 .. 2026-10-20.
+397 entries, 2026-08-06 .. 2026-10-20.
 
 | date | entry id | finding | file |
 |---|---|---|---|