weird search.cs

using System;

var rnd = new Random(Guid.NewGuid().GetHashCode());
Func<int, bool> predicat = x => x > 3;
var arr = new[] {1, 3, 7, 4, 5};
var check = new bool[arr.Length];
int count = arr.Length;

while(count > 0)
{
    int index = rnd.Next(arr.Length);
    
    if(!check[index])
    {
       if(predicat(arr[index]))
       {           
           Console.WriteLine(arr[index]);
       }
       count--;
       check[index] = true; 
    }
}

Console.WriteLine("Done!"); 

​weird search.output.txt

5
4
7
Done!

​​.sharplab.json

{
    "version": 1,
    "target": "Run",
    "mode": "Debug"
}