| ⊦ contains(`docs2store', mkarraytype(int_type), ty) ↔ ty = int_type |
⊦ contains(str, ty, ty0) ↔ (∃ tys. contains(str, ty ' + (tys + ty0)))
⊦ (∃ tys. contains(`docs2store', mkarraytype(int_type) ' + (tys + ty))) ↔ ty = int_type
[[CONCRETESIMPRULES : ()], [EXTRATERMS : (ty, mkarraytype(int_type), `docs2store')]]