映射和过滤Z3中的内置序列

Question

我正在尝试编写类似于here中关于Z3中内置序列的约束：

 feature pos gene_1 gene_2 gene_3 gene_n  sum_all  average_all
       A   1   6/87   2/87  51/87   0/87 sum_row1 average_row1
       A   2   4/87   5/87   8/87   2/87 sum_row2 average_row2
       A   3   1/87  74/87   5/87   0/87 sum_row3 average_row3
       B   1  11/54   2/54  41/54  89/54 sum_row4 average_row4
       B   2   4/54   5/54   3/54   5/54 sum_row5 average_row5
       B   3   4/54   0/54   5/54  21/54 sum_row6 average_row6

我可能这样做的方式不对，但我得到以下异常：

(declare-fun a () (Seq Int))
(declare-fun b () (Seq Int))

(assert (= a (seq.++ (seq.unit 1) (seq.unit 2))))

(assert (forall ((i Int)) (=> (and (<= 0 i) (< i (seq.len a))) (= (seq.at a i) (seq.at b i)))))

(check-sat)

一般情况下，Z3能否为描述“序列理解”的约束构建模型，即对内置序列进行映射和过滤？