| ⊦ ¬ rk .key ∈ fis ∧ rk .key ≠ _type ∧ rk .key ≠ _length ∧ is_fskey(rk .key) → (okarrays(r, fis, st[rk, val]) ↔ okarrays(r, fis, st)) |
is_fskey(rk .key) ⊦ rk .key = _type, rk .key = _length, okarrays(r, fis, st[rk, val]) ↔ okarrays(r, fis, st), rk .key ∈ fis
[[CONCRETESIMPRULES : ()]]