#include <bits/stdc++.h>
using namespace std;
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
template <typename T, typename V>
void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T>
void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto &i : x) cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V>
void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v)) cerr << ", ";
  _print(v...);
}
long long int ar[2000];
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long int t = 1;
  while (t--) {
    long long int n = 0, m = 0, k = 0, i = 0, j = 0, p = 0, q = 0, x = 0, y = 0,
                  z = 0, cnt = 0, l = 0, r = 0, mid = 0, lo = 0, hi = 0;
    string s;
    bool flag = false;
    vector<long long int> vec;
    vector<vector<long long int> > ans;
    cin >> n >> m;
    for (i = 1; i <= n; i++) cin >> ar[i];
    sort(ar + 1, ar + n + 1);
    for (i = n + 1; i >= 1; --i) {
      for (j = 1; j < i; j++) {
        vec.clear();
        for (k = i; k <= n; k++) vec.push_back(ar[k]);
        vec.push_back(ar[j]);
        ans.push_back(vec);
      }
    }
    for (i = 0; i < m; i++) {
      cout << ans[i].size();
      for (j = 0; j < ans[i].size(); j++) {
        cout << " " << ans[i][j];
      }
      cout << endl;
    }
  }
  return 0;
}
