ap(ks(2)) ⊦ ks(2) .1 .2 = K
[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ value(K)], [CSIMPSEQ : ⊦ ks(n) = K _ t1 _ t2 ↔ t1 = K ∧ t2 = K ∧ n = 2])]]