∀ n, n0. ¬(n ∈ ix0 ∧ all<(ix0, n0) ∧ n0 ≤ n), n ∈ m + ix0, all<(m + ix0, n0), n0 ≤ n ⊦
[Concretesimprules((Csimpgen(ilist freely generated by [], +;) Csimpnamedseq(list,indexseq,in-empty, ⊦ ¬ n ∈ [])))]