请大家帮忙给我讲一下执行过程
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Diamond
{
     class Program
     {
         static void Main(string[] args)
         {
             int q = Convert.ToInt32(Console.ReadLine());
             for (int i = 1; i <= q;i++ )
             {
                 for (int j = 1; j <=q-i;j++ )  
                 {
                     Console.Write(" ");                      
                 }                  
                 for (int k = 1; k <= 2 * i - 1;k++ )
                 {
                     Console.Write("*");                      
                 }
                 Console.WriteLine();                                                  
             }
             for (int i = 1; i <= q - 1;i++ )
             {
                 for (int j = 1; j <= i;j++ )
                 {
                     Console.Write(" ");                     
                 }
                 for (int k = 1; k <= 2 * q - 2 * i - 1; k++)
                 {
                     Console.Write("*");                     
                 }
                 Console.WriteLine();                 
             }             
         }
     }
}
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