j = i0 + 1, 0 < j ⊦ getarray(r, i, j, st) .rest = getarray(r, i + 1, i0, st)
[[CONCRETESIMPRULES : ([CSIMPELIM : ⊦ i0 = i - j ↔ i = i0 + j])], [EXTRATERMS : (j, 1, i0)]]