Problem: Ujan has a lot of numbers in his boxes. He likes order and balance, so he decided to reorder the numbers.

There are k boxes numbered from 1 to k. The i-th box contains n_i integer numbers. The integers can be negative. All of the integers are distinct.

Ujan is lazy, so he will do the following reordering of the numbers exactly once. He will pick a single integer from each of the boxes, k integers in total. Then he will insert the chosen numbers — one integer in each of the boxes, so that the number of integers in each box is the same as in the beginning. Note that he may also insert an integer he picked from a box back into the same box.

Ujan will be happy if the sum of the integers in each box is the same. Can he achieve this and make the boxes perfectly balanced, like all things should be?

Input

The first line contains a single integer k (1 ≤ k ≤ 15), the number of boxes. 

The i-th of the next k lines first contains a single integer n_i (1 ≤ n_i ≤ 5 000), the number of integers in box i. Then the same line contains n_i integers a_{i,1}, …, a_{i,n_i} (|a_{i,j}| ≤ 10^9), the integers in the i-th box. 

It is guaranteed that all a_{i,j} are distinct.

Output

If Ujan cannot achieve his goal, output "No" in a single line. Otherwise in the first line output "Yes", and then output k lines. The i-th of these lines should contain two integers c_i and p_i. This means that Ujan should pick the integer c_i from the i-th box and place it in the p_i-th box afterwards.

If there are multiple solutions, output any of those.

You can print each letter in any case (upper or lower).

Examples

Input


4
3 1 7 4
2 3 2
2 8 5
1 10


Output


Yes
7 2
2 3
5 1
10 4


Input


2
2 3 -2
2 -1 5


Output


No


Input


2
2 -10 10
2 0 -20


Output


Yes
-10 2
-20 1

Note

In the first sample, Ujan can put the number 7 in the 2nd box, the number 2 in the 3rd box, the number 5 in the 1st box and keep the number 10 in the same 4th box. Then the boxes will contain numbers \{1,5,4\}, \{3, 7\}, \{8,2\} and \{10\}. The sum in each box then is equal to 10.

In the second sample, it is not possible to pick and redistribute the numbers in the required way.

In the third sample, one can swap the numbers -20 and -10, making the sum in each box equal to -10.

Solution (in JAVA):

Solution:
import java.io.*;
import java.math.BigInteger;
import java.util.*;

public class Main {
	public static void main(String[] args) throws IOException {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		PrintWriter out = new PrintWriter(outputStream);
		InputReader in = new InputReader(inputStream);
		
//		for(int i=4;i<=4;i++) {
//			InputStream uinputStream = new FileInputStream("dining.in");
//			String f = i+".in";
//			InputStream uinputStream = new FileInputStream(f);
//			InputReader in = new InputReader(uinputStream);
//			PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("dining.out")));
			Task t = new Task();
			t.solve(in, out);
			out.close();			
//		}
	}	
	
	static class Task {
		int times = 0;
		public void solve(InputReader in, PrintWriter out) throws IOException {
//			//int xxx = in.nextInt();
//			//while(xxx-->0) {
//				int n = in.nextInt();
//				int k = in.nextInt();
//				int a[] = in.readIntArray(n);
//				int b[] = in.readIntArray(n);
//				ArrayList<Integer>[] g = new ArrayList[n];
//				for(int i=0;i<n;i++) g[i] = new ArrayList<Integer>();
//				for(int i=0;i<n-1;i++) {
//					g[a[i]-1].add(a[i+1]-1);
//					g[b[i]-1].add(b[i+1]-1);
//				}
//				boolean vis[] = new boolean[n];
//				int lvl[] = new int[n];
//				int low[] = new int[n];
//				int hash[] = new int[n];
//				times = 0;
//				dfs(a[0]-1,g,vis,low,lvl,hash);
//				int cycles = 0; int cycle_nodes = 0;
//				DSU dsu = new DSU(n);
//				for(int i=0;i<n;i++) {
//					if(hash[low[i]]<i) {
//						dsu.union(hash[low[i]], i);
//					}else {
//						dsu.union(i,hash[low[i]]);
//					}
//				}
//				HashMap<Integer,Integer> s = new HashMap<Integer,Integer>();
//				for(int i=0;i<n;i++) {
//					int tmp = dsu.find(i);
//					s.put(tmp, s.getOrDefault(tmp, 0)+1);
//					//low[i] = s.get(dsu.find(i));
//				}
//				for(int i:s.keySet()) {
//					if(s.get(i)>1) {
//						cycles++;
//						cycle_nodes+=s.get(i);
//					}
//				}
//				if(k==3) {
//					//Dumper.print("here");
//				}
//				if(n-cycle_nodes+cycles>=k) {
//					System.out.println("YES");
//					//out.println("YES");
//					int temp [] = new int[n];
//					for(int i=0;i<n;i++) temp[i] = low[a[i]-1];
//					for(int i=1;i<n;i++) {
//						if(temp[i]>temp[i-1]+1) temp[i] = temp[i-1]+1;				
//						if(temp[i]>=k) temp[i] = temp[i-1];								
//					}
//					for(int i=0;i<n;i++) {
//						low[a[i]-1] = temp[i]; 
//					}
//					for(int i=0;i<n;i++) {
//						System.out.print((char)('a'+low[i]));
//						//out.print((char)('a'+low[i]));
//					}
//					System.out.println();
//					//out.println();
//				}
//				else {
//					System.out.println("NO");
//					//out.println("NO");	
//				}
//			//}
			//int c = in.nextInt();
			//Dumper.print(Long.MAX_VALUE);
			
			//int c = in.nextInt();
			//while(c-->0) {
			//Dumper.print(Integer.MAX_VALUE);
			//Dumper.print((long)(100001)*100000/2);
			//}
//			int n = in.nextInt();
//			int k = in.nextInt();
//			int val[] = in.readIntArray(n);
//			ArrayList<Integer>[] g = new ArrayList[n];
//			for(int i=0;i<n;i++) g[i] = new ArrayList<Integer>();
//			for(int i=0;i<n-1;i++) {
//				int f = in.nextInt()-1;
//				int t = in.nextInt()-1;
//				g[f].add(t);
//				g[t].add(f);
//			}
//			int lvl[] = new int[n];
//			dfs(g,0,-1,lvl);
//			int dp[][] = new int[n][n];
//			dfs2(g,0,-1,lvl,dp,k,val,n);
//			out.println(dp[0][0]);
//		}
//		void dfs(ArrayList<Integer>[] g, int cur, int pre, int lvl[]) {
//			if(pre!=-1) lvl[cur] = lvl[pre]+1;
//			for(int nxt:g[cur]) {
//				if(pre==nxt) continue;
//				dfs(g,nxt,cur,lvl);
//			}
//		}
//		void dfs2(ArrayList<Integer>[] g, int cur, int pre, int lvl[], int dp[][], int k, int val[], int n) {
//			for(int nxt:g[cur]) {
//				if(pre!=nxt) dfs2(g,nxt,cur,lvl,dp,k,val,n);
//			}
//			
//			//copy best values at each level to this root node
//			for(int nxt:g[cur]) {
//				for(int i=lvl[cur]+k/2+1;i<n;i++) {
//					dp[cur][i] += dp[nxt][i];
//				}
//			}
//			
//			//chose this root node
//			int cur_lvl = lvl[cur];
//			int nxt_lvl = cur_lvl+k+1;
//			dp[cur][cur_lvl] = val[cur];
//			if(nxt_lvl<n) dp[cur][cur_lvl] += dp[cur][nxt_lvl];
//
//			//don't choose root node			
//			for(int j=1;j<=k/2;j++) {				
//				int son_lvl1 = cur_lvl+j;
//				int son_lvl2 = cur_lvl+k+1-j;	
//				if(son_lvl2>=n) continue;				
//				for(int nxt:g[cur]) {
//					if(pre==nxt) continue;
//					int tmp = dp[nxt][son_lvl1] + dp[cur][son_lvl2] - dp[nxt][son_lvl2];
//					if(tmp>dp[cur][son_lvl1]) dp[cur][son_lvl1] = tmp;
//				}
//			}
//			for(int j=n-2;j>=cur_lvl;j--) {
//				dp[cur][j] = Math.max(dp[cur][j], dp[cur][j+1]);
//			}
			int k = in.nextInt();
			long sum = 0;
			ArrayList<Long>[] arr = new ArrayList[k];
			HashMap<Long,Integer> groupFinder = new HashMap<Long,Integer>();
			long[] sub_sum = new long[k];
			
			for(int i=0;i<k;i++) {
				int tmp = in.nextInt();
				arr[i] = new ArrayList<Long>();
				for(int j=0;j<tmp;j++) {
					long t = in.nextLong();
					arr[i].add(t);
					sub_sum[i] += t;
					sum+=t;
					groupFinder.put(t, i);
				}
			}

			if(sum%k!=0) {
				out.println("NO");
				return;
			}
			
			long target = sum/k;
			HashMap<Long, Long> nxt = new HashMap<Long, Long>();
			for(int i=0;i<k;i++) {
				for(long j:arr[i]) {
					long val = target-sub_sum[i]+j;
					if(val==j) nxt.put(j, j);
					else {
						Integer group = groupFinder.get(val);
						if(group!=null&&group!=i) {
							nxt.put(j, val);
						}
					}
				}
			}
			HashMap<Integer,ArrayList<Long>> cyc = new HashMap<Integer,ArrayList<Long>>();
			for(int i=0;i<k;i++) {
				for(long j:arr[i]) {
					ArrayList<Long> path = new ArrayList<Long>();
					dfs(nxt,groupFinder,j,j,0,path,cyc);
				}
			}
			int dp[][] = new int[1<<k][3];
			for(int i=0;i<1<<k;i++) Arrays.fill(dp[i], -1);
			for(int x:cyc.keySet()) {
				dp[x][0] = 1;
				dp[x][1] = x;
			}
			for(int i=1;i<1<<k;i++) {
				for(int j=i;j>0;j=(j-1)&i) {
					if(dp[j][0]!=-1&&dp[i^j][0]!=-1) {
						dp[i][0] = 1;
						dp[i][1] = j;
						dp[i][2] = i^j;
						break;
					}
				}
			}
			if(dp[(1<<k)-1][0]==-1) {
				out.println("NO");
			}else {
				out.println("YES");
				long ret[][] = new long[k][2];
				print(ret, groupFinder,cyc,dp,(1<<k)-1);
				for(int i=0;i<k;i++) out.println(ret[i][0]+" "+ret[i][1]);
			}
		}
		void print(long ret[][], HashMap<Long,Integer> groupFinder, HashMap<Integer,ArrayList<Long>> cyc, int dp[][], int cur) {
			if(dp[cur][2]==-1) {
				ArrayList<Long> tmp = cyc.get(cur);
				for(int i=tmp.size()-1;i>0;i--) {
					int g1 = groupFinder.get(tmp.get(i));
					int g2 = groupFinder.get(tmp.get(i-1))+1;
					ret[g1][0] = tmp.get(i);
					ret[g1][1] = g2;
				}
				return;
			}
			print(ret,groupFinder,cyc,dp,dp[cur][1]);
			print(ret,groupFinder,cyc,dp,dp[cur][2]);
		}
		
		void dfs(HashMap<Long,Long> nxt, HashMap<Long,Integer> groupFinder, long start, long cur, int mask, ArrayList<Long> path, HashMap<Integer,ArrayList<Long>> cyc) {
			int cur_group = groupFinder.get(cur);
			if((mask&1<<cur_group)!=0) {
				if(cur==start) {
					path.add(start);
					cyc.put(mask, path);
				}
				return;
			}
			if(nxt.containsKey(cur)) {
				path.add(cur);
				dfs(nxt,groupFinder,start,nxt.get(cur),mask|1<<cur_group,path,cyc);
			}
		}
	
		class pair implements Comparable<pair>{
			int idx, val;
			public pair(int a, int b) {
				idx = a;
				val = b;
			}
			@Override
			public int compareTo(pair t) {
				return t.val-this.val;
			}
		}
		
		class E_598{
//			int n = in.nextInt();
//			while(n-->0) {
//				int m = in.nextInt();
//				TreeSet<Integer>[] st = new TreeSet[26];
//				for(int i=0;i<26;i++) st[i] = new TreeSet<Integer>();
//				char a[] = in.next().toCharArray();
//				char b[] = in.next().toCharArray();
//				int c1[] = new int[26];
//				int c2[] = new int[26];
//				for(char x:a) c1[x-'a']++;
//				for(char x:b) c2[x-'a']++;
//				boolean flag = true;
//				for(int i=0;i<26;i++) if(c1[i]!=c2[i]) {
//					out.println("NO");
//					flag = false;
//					break;
//				}
//				if(!flag) continue;
//				for(int i=m-1;i>=0;i--) {
//					st[a[i]-'a'].add(i);
//				}
//				int c=0;
//				for(int i=0;i<m;i++) {
//					if(a[i]==b[i]) {
//						st[a[i]-'a'].remove(st[a[i]-'a'].first());
//					}else {
//						int p = st[b[i]-'a'].first();
//						st[b[i]-'a'].remove(p);
//						if(p!=i+1) c+=2;
//						else c++;
//						st[a[i]-'a'].add(i);
//					}
//				}
//				out.println(c%2==0?"YES":"NO");
//			}
		}
		
		class interval implements Comparable<interval>{
			int from; int to; int idx;
			public interval(int a, int b, int c) {
				from=a;
				to=b;
				idx=c;
			}
			@Override
			public int compareTo(interval t) {
				if(this.to==t.to) return this.from-t.from;
				return this.to-t.to;
			}
		}	    
	    class sgt{
	    	sgt lt;
	    	sgt rt;
	    	int l,r;
	    	long sum, max, min, lazy;
	    	public sgt(int L, int R, int arr[]) {
	    		l=L;r=R;
	    		if(l==r-1) {
	    			sum = max = min = arr[l];
	    			lazy = 0;
	    			return;
	    		}
	    		lt = new sgt(l, l+r>>1, arr);
	    		rt = new sgt(l+r>>1, r, arr);
	    		pop_up();
	    	}
	    	void pop_up() {
	    		this.sum = lt.sum + rt.sum;
	    		this.max = Math.max(lt.max, rt.max);
	    		this.min = Math.min(lt.min, rt.min);
	    	}
	    	void push_down() {
	    		if(this.lazy!=0) {
	    			lt.sum+=lazy;
	    			rt.sum+=lazy;
	    			lt.max+=lazy;
	    			lt.min+=lazy;
	    			rt.max+=lazy;
	    			rt.min+=lazy;
	    			lt.lazy+=this.lazy;
	    			rt.lazy+=this.lazy;
	    			this.lazy = 0;
	    		}
	    	}
	    	void change(int L, int R, int v) {
	    		if(R<=l||r<=L) return;
	    		if(L<=l&&r<=R) {
	    			this.max+=v;
	    			this.min+=v;
	    			this.sum+=v*(r-l);
	    			this.lazy+=v;
	    			return;
	    		}
	    		push_down();
	    		lt.change(L, R, v);
	    		rt.change(L, R, v);
	    		pop_up();
	    	}
	    	long query_max(int L, int R) {
	    		if(L<=l&&r<=R) return this.max;
	    		if(r<=L||R<=l) return Long.MIN_VALUE;
	    		push_down();
	    		return Math.max(lt.query_max(L, R), rt.query_max(L, R));	    		
	    	}
	    	long query_min(int L, int R) {
	    		if(L<=l&&r<=R) return this.min;
	    		if(r<=L||R<=l) return Long.MAX_VALUE;
	    		push_down();
	    		return Math.min(lt.query_min(L, R), rt.query_min(L, R));	
	    	}
	    	long query_sum(int L, int R) {
	    		if(L<=l&&r<=R) return this.sum;
	    		if(r<=L||R<=l) return 0;
	    		push_down();
	    		return lt.query_sum(L, R) + rt.query_sum(L, R);
	    	}
	    }	   
			    	
		List<List<String>> convert(String arr[][]){
			int n = arr.length;
			List<List<String>> ret = new ArrayList<>();
			for(int i=0;i<n;i++) {
				ArrayList<String> tmp = new ArrayList<String>();
				for(int j=0;j<arr[i].length;j++) tmp.add(arr[i][j]);
				ret.add(tmp);
			}
			return ret;
		}
		
		public class TreeNode {
			int val;
			TreeNode left;
			TreeNode right;
			TreeNode(int x) { val = x; }
		}
	
		public int GCD(int a, int b) {
		   if (b==0) return a;
		   return GCD(b,a%b);
		}
		public long GCD(long a, long b) {
			   if (b==0) return a;
			   return GCD(b,a%b);
			}		
	}
	
	
    static class ArrayUtils {
        static final long seed = System.nanoTime();
        static final Random rand = new Random(seed);

        public static void sort(int[] a) {
            shuffle(a);
            Arrays.sort(a);
        }

        public static void shuffle(int[] a) {
            for (int i = 0; i < a.length; i++) {
                int j = rand.nextInt(i + 1);
                int t = a[i];
                a[i] = a[j];
                a[j] = t;
            }
        }

    }	
	static class BIT{
		int arr[];
		int n;
		public BIT(int a) {
			n=a;
			arr = new int[n];
		}
		int sum(int p) {
			int s=0;
			while(p>0) {
				s+=arr[p];
				p-=p&(-p);
			}
			return s;
		}
		void add(int p, int v) {
			while(p<n) {
				arr[p]+=v;
				p+=p&(-p);
			}
		}
	}
	static class DSU{
		int[] arr;
		int[] sz;
		public DSU(int n) {
			arr = new int[n];
			sz = new int[n];
			for(int i=0;i<n;i++) arr[i] = i;
			Arrays.fill(sz, 1);
		}
		public int find(int a) {
			if(arr[a]!=a) arr[a] = find(arr[a]);
			return arr[a];
		}
		public void union(int a, int b) {
			int x = find(a);
			int y = find(b);
			if(x==y) return;
			arr[y] = x;
			sz[x] += sz[y];
		}
		public int size(int x) {
			return sz[find(x)];
		}
	}	
	static class MinHeap<Key> implements Iterable<Key> {
		private int maxN;
		private int n;
		private int[] pq;
		private int[] qp;
		private Key[] keys;
		private Comparator<Key> comparator;
		
		public MinHeap(int capacity){
			if (capacity < 0) throw new IllegalArgumentException();
			this.maxN = capacity;
			n=0;
			pq = new int[maxN+1];
			qp = new int[maxN+1];
			keys = (Key[]) new Object[capacity+1];
			Arrays.fill(qp, -1);
		}
		
		public MinHeap(int capacity, Comparator<Key> c){
			if (capacity < 0) throw new IllegalArgumentException();
			this.maxN = capacity;
			n=0;
			pq = new int[maxN+1];
			qp = new int[maxN+1];
			keys = (Key[]) new Object[capacity+1];
			Arrays.fill(qp, -1);
			comparator = c;
		}			
		public boolean isEmpty()	{ return n==0; 	}
		public int size()			{ return n;		}
		public boolean contains(int i) {
	        if (i < 0 || i >= maxN) throw new IllegalArgumentException();
	        return qp[i] != -1;
		}	
		public int peekIdx() {
	        if (n == 0) throw new NoSuchElementException("Priority queue underflow");
	        return pq[1];		
		}	
		public Key peek(){
			if(isEmpty()) throw new NoSuchElementException("Priority queue underflow");
			return keys[pq[1]];
		}
		public int poll(){
			if(isEmpty()) throw new NoSuchElementException("Priority queue underflow");
			int min = pq[1];
			exch(1,n--);
			down(1);
			assert min==pq[n+1];
			qp[min] = -1;
			keys[min] = null;		
			pq[n+1] = -1;
			return min;
		}
	    public void update(int i, Key key) {
	        if (i < 0 || i >= maxN) throw new IllegalArgumentException();
	        if (!contains(i)) {
	        	this.add(i, key);
	        }else {
	        	keys[i] = key;
	        	up(qp[i]);
	        	down(qp[i]);
	        }
	    }	
		private void add(int i, Key x){
	        if (i < 0 || i >= maxN) throw new IllegalArgumentException();
	        if (contains(i)) throw new IllegalArgumentException("index is already in the priority queue");
	        n++;
	        qp[i] = n;
	        pq[n] = i;
	        keys[i] = x;
	        up(n);
		}
		private void up(int k){
			while(k>1&&less(k,k/2)){
				exch(k,k/2);
				k/=2;
			}
		}
		private void down(int k){
			while(2*k<=n){
				int j=2*k;
				if(j<n&&less(j+1,j)) j++;
				if(less(k,j)) break;
				exch(k,j);
				k=j;
			}
		}
		
		public boolean less(int i, int j){
	        if (comparator == null) {
	            return ((Comparable<Key>) keys[pq[i]]).compareTo(keys[pq[j]]) < 0;
	        }
	        else {
	            return comparator.compare(keys[pq[i]], keys[pq[j]]) < 0;
	        }
		}

		public void exch(int i, int j){
	        int swap = pq[i];
	        pq[i] = pq[j];
	        pq[j] = swap;
	        qp[pq[i]] = i;
	        qp[pq[j]] = j;
		}

		@Override
		public Iterator<Key> iterator() {
			// TODO Auto-generated method stub
			return null;
		}
	}  	

    private static class InputReader
    {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int zcurChar;
        private int znumChars;
        private SpaceCharFilter filter;

        public InputReader(InputStream stream)
        {
            this.stream = stream;
        }

        public int read()
        {
            if (znumChars == -1)
                throw new InputMismatchException();
            if (zcurChar >= znumChars)
            {
            	zcurChar = 0;
                try
                {
                    znumChars = stream.read(buf);
                } catch (IOException e)
                {
                    throw new InputMismatchException();
                }
                if (znumChars <= 0)
                    return -1;
            }
            return buf[zcurChar++];
        }

        public int nextInt()
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-')
            {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do
            {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public String nextString()
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do
            {
                res.appendCodePoint(c);
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public double nextDouble()
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-')
            {
                sgn = -1;
                c = read();
            }
            double res = 0;
            while (!isSpaceChar(c) && c != '.')
            {
                if (c == 'e' || c == 'E')
                    return res * Math.pow(10, nextInt());
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            if (c == '.')
            {
                c = read();
                double m = 1;
                while (!isSpaceChar(c))
                {
                    if (c == 'e' || c == 'E')
                        return res * Math.pow(10, nextInt());
                    if (c < '0' || c > '9')
                        throw new InputMismatchException();
                    m /= 10;
                    res += (c - '0') * m;
                    c = read();
                }
            }
            return res * sgn;
        }

        public long nextLong()
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-')
            {
                sgn = -1;
                c = read();
            }
            long res = 0;
            do
            {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c)
        {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public String next()
        {
            return nextString();
        }

        public interface SpaceCharFilter
        {
            public boolean isSpaceChar(int ch);
        }
        public int[] readIntArray(int n) {
            int[] ret = new int[n];
            for (int i = 0; i < n; i++) {
                ret[i] = nextInt();
            }
            return ret;
        }        
    }    

	static class Dumper {
		static void print_int_arr(int[] arr) {
			for (int i = 0; i < arr.length; i++) {
				System.out.print(arr[i] + " ");
			}
			System.out.println();
			System.out.println("---------------------");
		}

		static void print_char_arr(char[] arr) {
			for (int i = 0; i < arr.length; i++) {
				System.out.print(arr[i] + " ");
			}
			System.out.println();
			System.out.println("---------------------");
		}

		static void print_double_arr(double[] arr) {
			for (int i = 0; i < arr.length; i++) {
				System.out.print(arr[i] + " ");
			}
			System.out.println();
			System.out.println("---------------------");
		}

		static void print_2d_arr(int[][] arr, int x, int y) {
			for (int i = 0; i < x; i++) {
				for (int j = 0; j < y; j++) {
					System.out.print(arr[i][j] + " ");
				}
				System.out.println();
			}
			System.out.println();
			System.out.println("---------------------");
		}

		static void print_2d_arr(boolean[][] arr, int x, int y) {
			for (int i = 0; i < x; i++) {
				for (int j = 0; j < y; j++) {
					System.out.print(arr[i][j] + " ");
				}
				System.out.println();
			}
			System.out.println();
			System.out.println("---------------------");
		}

		static void print(Object o) {
			System.out.println(o.toString());
		}

		static void getc() {
			System.out.println("here");
		}
	}
}