6078：Wavel Sequence

Have you ever seen the wave? It's a wonderful view of nature. Little Q is attracted to such wonderful thing, he even likes everything that looks like wave. Formally, he defines a sequence $a_1,a_2,...,a_n$ as ''wavel'' if and only if $a_1<a_2>a_3<a_4>a_5<a_6...$



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Now given two sequences $a_1,a_2,...,a_n$ and $b_1,b_2,...,b_m$, Little Q wants to find two sequences $f_1,f_2,...,f_k(1\leq f_i\leq n,f_i<f_{i+1})$ and $g_1,g_2,...,g_k(1\leq g_i\leq m,g_i<g_{i+1})$, where $a_{f_i}=b_{g_i}$ always holds and sequence $a_{f_1},a_{f_2},...,a_{f_k}$ is ''wavel''.

Moreover, Little Q is wondering how many such two sequences $f$ and $g$ he can find. Please write a program to help him figure out the answer.

The first line of the input contains an integer $T(1\leq T\leq15)$, denoting the number of test cases.

In each test case, there are $2$ integers $n,m(1\leq n,m\leq 2000)$ in the first line, denoting the length of $a$ and $b$.

In the next line, there are $n$ integers $a_1,a_2,...,a_n(1\leq a_i\leq 2000)$, denoting the sequence $a$.

Then in the next line, there are $m$ integers $b_1,b_2,...,b_m(1\leq b_i\leq 2000)$, denoting the sequence $b$.

For each test case, print a single line containing an integer, denoting the answer. Since the answer may be very large, please print the answer modulo $998244353$.