⊦ inodekey(n) ∈ ri[key, adr] ↔ n ∈ ri.inos ∪ (key.inode? ⊃ ∅ ++ key.ino;∅)
Used simplifier rules: inos-node-store-def: ⊦ n ∈ ri.inos ↔ inodekey(n) ∈ ri;