using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public class Test {

        public int a {get;set;}

        public int b {get;set;}

        public int c {get;set;}

        public int d {get;set;}

    }

    public static List<List<int>> GeneratePermutations()

    {

        List<int> data = [0,2,5];

        var max = data.Count - 1;

        List<List<int>> list = [];

        for (int i = max; i >= 0; i--)

        {

            for (int j = max; j >= 0; j--)

            {

                list.Add([data[i],data[j],5,5]);

            }

        }

        for (int i = max; i >= 0; i--)

        {

            for (int j = max; j >= 0; j--)

            {

                for (int k = max; k >= 0; k--)

                {

                    list.Add([data[i],data[j],data[k],5]);

                }

            }

        }

        for (int i = max; i >= 0; i--)

        {

            for (int j = max; j >= 0; j--)

            {

                for (int k = max; k >= 0; k--)

                {

                    list.Add([data[i],data[j],5,data[k]]);

                }

            }

        }

        return list.Distinct(new ListComparer()).Reverse().ToList();

    }

    public static void Main()

    {

        // a pol, b pod, c por, d del

        var list = new List<Test>{

            new Test {a= 5,b= 5,c= 5,d= 5},

            new Test {a= 5,b= 0,c= 5,d= 5},

            new Test {a= 5,b= 5,c= 0,d= 5},

            new Test {a= 5,b= 5,c= 5,d= 0},

            new Test {a= 5,b= 2,c= 5,d= 2},

            new Test {a= 2,b= 5,c= 2,d= 5},

            new Test {a= 2,b= 0,c= 5,d= 2},

            new Test {a= 0,b= 5,c= 2,d= 0},

            new Test {a= 0,b= 2,c= 2,d= 5},

            new Test {a= 0,b= 0,c= 0,d= 5},

            new Test {a= 5,b= 2,c= 0,d= 2},

            new Test {a= 5,b= 0,c= 2,d= 0}

        };

        var compare = GeneratePermutations();

        foreach(var data in compare.AsQueryable().Reverse().ToList()) {

            Console.WriteLine($"[{data[0]},{data[1]},{data[2]},{data[3]}]");

        }

        var newData = list.OrderByDescending(data => compare.FindIndex(c => c[0] == data.a && c[1] == data.b && c[2] == data.c && c[3] == data.d));

        foreach(var data in newData) {

            Console.WriteLine($"a = {data.a}, b = {data.b}, c = {data.c}, d = {data.d}, index = {compare.FindIndex(c => c[0] == data.a && c[1] == data.b && c[2] == data.c && c[3] == data.d)}");

        }

    }

    public class ListComparer : IEqualityComparer<List<int>>

    {

        public bool Equals(List<int> x, List<int> y)

        {

            if (x.Count != y.Count())

                return false;

​

            for (int i = 0; i < x.Count; i++)

            {

                if (x[i] != y[i])

                    return false;

            }

​

            return true;

        }

​

        public int GetHashCode(List<int> obj)

        {

            int hash = 17;

​

            foreach (var item in obj)

            {

                hash = hash * 23 + item.GetHashCode();

            }

​

            return hash;

        }

    }

}