using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class MainClass {
    public static void Main() {
        string[] presidents = {"G123456", "H", "a", "H", "over", "Jack"};
        bool all = presidents.All(s => s.Length > 5);
        Console.WriteLine(all);
    }
}

    

   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class MainClass {
    public static void Main() {
        string[] presidents = {"G", "H", "a", "H", "over", "Jack"};
        bool all = presidents.All(s => s.Length > 3);
        Console.WriteLine(all);
    }
}

    

   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class MainClass {
    public static void Main() {
        string[] presidents = {"G", "H", "a", "H", "over", "Jack"};

        bool any = presidents.Any();
        Console.WriteLine(any);
    }
}

    

   
 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;

public class MainClass{
   public static void Main(){
       int[] numbers = { 2, 6, 1, 5, 10 };
       Console.WriteLine("Is there at least one odd number?");
       Console.Write(numbers.Any(e => e % 2 == 1) ? "Yes, there is" : "No, there isn't");
   }
}

    

   
 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class MainClass {
    public static void Main() {
        string[] words = { "bei", "rie", "rei", "field" };

        bool iAfterE = words.Any(w => w.Contains("ei"));

        Console.WriteLine("There is a word that contains in the list that contains 'ei': {0}", iAfterE);
    }
}

    

   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class MainClass {
    public static void Main() {
        int N = 5;
        IEnumerable<int> intSequence = Enumerable.Range(1, N);
        foreach (int item in intSequence)
            Console.WriteLine(item);
        int agg = intSequence.Aggregate((av, e) => av * e);
        Console.WriteLine("{0}! = {1}", N, agg);

    }
}

    

   
 

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public class MainClass {
    public static void Main() {
        IEnumerable<int> intSequence = Enumerable.Range(1, 10);
        foreach (int item in intSequence)
            Console.WriteLine(item);
        int sum = intSequence.Aggregate(0, (s, i) => s + i);
        Console.WriteLine(sum);
    }
}