H0 ⊥ H1, ∀ H, H0, r. # H < # H1 → (H0 ⊥ H → (r ∈ H0 ∪ H ↔ r ∈ H0 ∨ r ∈ H)) ⊦ r ∈ H0 ∪ H1 ↔ r ∈ H0 ∨ r ∈ H1
[[CONCRETESIMPRULES : ([CSIMPLESSPRED : <])], [EXTRATERMS : (# H1)]]