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    "result": "This postcondition looks only at the subject's output program and first collects every operation carrying an `sb_index` attribute, then builds `sb` as the transitive closure of a single edge relation: an operation's result whose type is exactly `none` flowing into any operation that uses it, with the closure taken over the whole output program rather than only the tagged operations. From the tagged set it derives four selections: `effects`, tagged ops whose name is exactly `dataflow.load`, `dataflow.store`, `dataflow.atomic_rmw`, or `dataflow.cmpxchg`; `atomic_ops`, tagged ops with a `contract` attribute whose `kind` is one of `#dataflow.atomic_access`, `#dataflow.fence_contract`, `#dataflow.rmw_contract`, or `#dataflow.cmpxchg_contract`; and `volatile_ops`, `release_ops`, and `acquire_ops`, each selected by exact string equality of `contract.canonical_text` against a closed list of literal spellings (for example plain access with `is_volatile = true`, or atomic access at `release`/`acquire`/`seq_cst` with `sync_scope = <system>` and `source_alignment_bytes = 4`, and fence contracts at `release`/`acquire`/`seq_cst` with `sync_scope = <system>`), so any contract text differing in ordering, scope, alignment, or formatting is simply not selected. The quantification is universal and pairwise over these selections, with ordering always decided by the integer value of `sb_index`: for every ordered pair of `atomic_ops` and separately of `volatile_ops` with strictly increasing `sb_index`, the earlier operation must reach the later one in `sb`; for every `release_ops` member, every `effects` member with a strictly smaller `sb_index` must reach it; and for every `acquire_ops` member, it must reach every `effects` member with a strictly larger `sb_index`. The only admitted value sources are the operation's own `name`, the presence and content of its `sb_index` and `contract` attributes, and result/use/type structure of the output program; nothing is compared against the input program and no operation lacking `sb_index` is ever a pair endpoint. It accepts a program exactly when all four required reachability pairs hold under the `none`-typed-edge closure, and rejects it as soon as one required pair is missing from that closure, regardless of any other ordering mechanism present. Note that the assertions never forbid extra edges, so additional ordering beyond what is demanded is accepted. Behavior is vacuous whenever the relevant selections are empty or singleton \u2014 no `sb_index`-tagged ops at all, fewer than two matching atomics or volatiles, no exact-text release/acquire matches, or no tagged ops with the four effect names \u2014 and also when `sb_index` comparisons never yield a strictly ordered pair; non-vacuous behavior requires at least one qualifying pair with strictly ordered indices, and reading `sb_index.int` or `contract` on a selected operation whose attribute is not of the expected kind would be an evaluation error rather than a clean rejection.",
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