#include <bits/stdc++.h>
#include <chrono>
using namespace std;
#define reps(i,s,n) for(int i = s; i < n; i++)
#define rep(i,n) reps(i,0,n)
#define Rreps(i,n,e) for(int i = n - 1; i >= e; --i)
#define Rrep(i,n) Rreps(i,n,0)
#define ALL(a) a.begin(), a.end()
#define fi first
#define se second
typedef long long ll;
typedef vector<ll> vec;
typedef vector<vec> mat;

ll N,M,H,W,Q,K,A,B;
string S;
typedef pair<ll, ll> P;
const ll INF = (1LL<<58);

class mint{
    public:
        ll x;
        static unsigned long long mod;
        static unsigned long long mod_plus;
        mint(){x = 0;}
        mint(ll _x) : x((_x < 0 ? ((_x += mod_plus) < 0 ? _x + mod_plus : _x) : _x)%mod){}
        /*mint& operator=(const ll &a){
            x = a;
            return *this;
        }*/

        mint operator-(){
            return x == 0 ? 0 : mod - x;
        }
        mint& operator+=(const mint& a){
            if((x += a.x) >= mod) x -= mod;
            return *this;
        }
        mint operator+(const mint& a) const{
            mint res(*this);
            return res += a;
        }
        mint& operator-=(const mint& a){
            if((x -= a.x) < 0) x += mod;
            return *this;
        }
        mint operator-(const mint& a) const{
            mint res(*this);
            return res -= a;
        }
        mint& operator*=(const mint& a){
            (x *= a.x)%=mod;
            return *this;
        }
        /*mint& operator*=(const ll& a){
            mint temp(a);
            return *this *= temp;
        }*/
        mint operator*(const mint& a) const{
            mint res(*this);
            return res *= a;
        }
        /*mint operator*(const ll& a) const{
            mint res(*this);
            return res *= a;
        }*/
        mint pow(unsigned long long pw) const{
            mint res(1), comp(*this);
            while(pw){
                if(pw&1) res *= comp;
                comp *= comp;
                pw >>= 1;
            }
            return res;
        }
        //以下、modが素数のときのみ
        mint inv() const{
            mint res(*this);
            return res.pow(mod - 2);
        }
        mint& operator/=(const mint &a){
            (x *= a.inv().x)%=mod;
            return *this;
        }
        mint operator/(const mint &a) const{
            mint res(*this);
            return res /= a;
        }
};
ostream& operator<<(ostream& os, const mint& a){
    os << a.x;
    return os;
}
unsigned long long mint::mod = 998244353;
unsigned long long mint::mod_plus = (LLONG_MAX / mint::mod) * mint::mod;
typedef vector<mint> vm;
/*
mint dfs(int bit, int k, int s, vec &num){
    if(k == K) return 1;
    if(bit == 10) return 0;
    mint res(0);
    res += dfs(bit + 1, k, s, num) + dfs(bit + 1, k, s + (1<<bit), num);
    if(s != 0){
        res += dfs(bit + 1, k + 1, 0, num) * (num[s] + num[s + (1<<bit)]);
    }
    if(res.x != 0) cout<<bit<<' '<<k<<' '<<s<<endl;
    return res;
}
 */


int main() {
    cin>>N>>K;
    vec a(N), num(1<<10, 0);
    rep(i,N) {
        cin >> a[i];
        ++num[a[i]];
    }
    vector<vm> dp(K + 1, vm(1<<10, 0));
    dp[0][0] = 1;
    rep(k, K){
        rep(s, 1<<10){
            int t = ((1<<10) - 1) ^ s;
            for(int i = t; i != 0; i = (i - 1)&t){
                dp[k+1][s | i] += dp[k][s] * num[i];
            }
        }
    }
    mint ans(0);
    rep(s, 1<<10) ans += dp[K][s];
    rep(i, K) ans /= i + 1;
    cout<<ans<<endl;
}