⊦ getarray(r, i, j, st) = [] ↔ j ≤ 0
[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ i < j → ¬ j < i], [CSIMPSEQ : ⊦ ¬ i ≤ j ↔ j < i], [CSIMPSEQ : ⊦ # vals = 0 ↔ vals = []])]]