#include <bits/stdc++.h>
#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;
#define ll long long
#define rep(i, m, n) for (int i = m; i < n; i++)
#define UE(N) N.erase(unique(N.begin(), N.end()), N.end());
#define Sort(n) sort(n.begin(), n.end())
#define mod 998244353
#define chmin(a, b) a = (((a) > (b)) ? (b) : (a))

template<typename U = unsigned, int B = 32>
class lazy_binary_trie {
    struct node {
        int cnt;
        U lazy;
        node *ch[2];
        node() : cnt(0), lazy(0), ch{ nullptr, nullptr } {}
    };
    void push(node* t, int b) {
        if ((t->lazy >> (U)b) & (U)1) swap(t->ch[0], t->ch[1]);
        if (t->ch[0]) t->ch[0]->lazy ^= t->lazy;
        if (t->ch[1]) t->ch[1]->lazy ^= t->lazy;
        t->lazy = 0;
    }
    node* add(node* t, U val, int b = B - 1) {
        if (!t) t = new node;
        t->cnt += 1;
        if (b < 0) return t;
        push(t, b);
        bool f = (val >> (U)b) & (U)1;
        t->ch[f] = add(t->ch[f], val, b - 1);
        return t;
    }
    node* sub(node* t, U val, int b = B - 1) {
        assert(t);
        t->cnt -= 1;
        if (t->cnt == 0) return nullptr;
        if (b < 0) return t;
        push(t, b);
        bool f = (val >> (U)b) & (U)1;
        t->ch[f] = sub(t->ch[f], val, b - 1);
        return t;
    }
    U get_min(node* t, U val, int b = B - 1) {
        assert(t);
        if (b < 0) return 0;
        push(t, b);
        bool f = (val >> (U)b) & (U)1; f ^= !t->ch[f];
        return get_min(t->ch[f], val, b - 1) | ((U)f << (U)b);
    }
    U get(node* t, int k, int b = B - 1) {
        if (b < 0) return 0;
        push(t, b);
        int m = t->ch[0] ? t->ch[0]->cnt : 0;
        return k < m ? get(t->ch[0], k, b - 1) : get(t->ch[1], k - m, b - 1) | ((U)1 << (U)b);
    }
    int count_lower(node* t, U val, int b = B - 1) {
        if (!t || b < 0) return 0;
        push(t, b);
        bool f = (val >> (U)b) & (U)1;
        return (f && t->ch[0] ? t->ch[0]->cnt : 0) + count_lower(t->ch[f], val, b - 1);
    }
    node *root;
public:
    lazy_binary_trie() : root(nullptr) {}
    int size() const {
        return root ? root->cnt : 0;
    }
    bool empty() const {
        return !root;
    }
    void insert(U val) {
        root = add(root, val);
    }
    void erase(U val) {
        root = sub(root, val);
    }
    void xor_all(U val) {
        if (root) root->lazy ^= val;
    }
    U max_element(U bias = 0) {
        return get_min(root, ~bias);
    }
    U min_element(U bias = 0) {
        return get_min(root, bias);
    }
    int lower_bound(U val) { // return id
        return count_lower(root, val);
    }
    int upper_bound(U val) { // return id
        return count_lower(root, val + 1);
    }
    U operator[](int k) {
        assert(0 <= k && k < size());
        return get(root, k);
    }
    int count(U val) {
        if (!root) return 0;
        node *t = root;
        for (int i = B - 1; i >= 0; i--) {
            push(t, i);
            t = t->ch[(val >> (U)i) & (U)1];
            if (!t) return 0;
        }
        return t->cnt;
    }
};


int N, K;
vector<int> A, C(1024);
vector<vector<int>> D(1024, vector<int>(1024, 0));
vector<lazy_binary_trie<int, 12>> B(1024);
void dfs(int cnt, int x, int prev) {
    if(!cnt) {
        B[prev].insert(x);
        C[x]++;
        D[prev][x]++;
    }
    else {
        rep(i, 0, K) {
            if(A[i] == prev) continue;
            dfs(cnt - 1, x ^ A[i], A[i]);
        }
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int X, Y;
    cin >> N >> K >> X >> Y;
    A.resize(K);
    rep(i, 0, K) cin >> A[i];
    Sort(A), UE(A);
    K = A.size();
    dfs(N / 2, 0, -1);
    ll res = 0; 
    /*
    rep(i, 0, 1024) rep(j, 0, 1024) {
        B[i].xor_all(j);
        res += (ll)(B[i].upper_bound(Y) - B[i].lower_bound(X)) * (C[j] - D[i][j]);
        B[i].xor_all(j);
    }*/
    cout << res % mod << endl;
}