enrich
ostore
with
functions insert : elem × data × store → store;
lookup : elem × store → data;
axioms insert-def : ⊦ st[a, d] = insert(a, d, st);
used for: s, nokodkodax;
lookup-def : ⊦ st[a] = lookup(a, st);
used for: s, nokodkodax;
end enrich