/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		ArrayList<Integer> list = new ArrayList<>(Arrays.asList(1,2,3,4,5,6,7,8,1,2,3,4));
        int listSize = list.size();
 
        ArrayList<ArrayList<Integer>> listArr = new ArrayList<>(listSize/4);
 
        for (int i = 0; i < listSize; i += 4) {
            ArrayList<Integer> listOfNums = new ArrayList<>();
            listOfNums.add(list.get(i + 1));
            listOfNums.add(list.get(i + 2));
            listOfNums.add(list.get(i + 3));
            listOfNums.add(list.get(i));
            listArr.add(listOfNums);
        }
 
        // Это чтоб пробежаться только по уникальным значениям листа.
        Set<ArrayList<Integer>> uniqueSet = new HashSet<ArrayList<Integer>>(listArr);
 
        for (ArrayList<Integer> temp : uniqueSet) {
            System.out.println("counts of " + temp + ": " + Collections.frequency(listArr, temp));
        }
	}
}

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