- using static System.Console; 
- using System.Collections.Generic; 
-   
- public class Program { 
-     public static void Main() { 
-         var lista = new List<int>() { 1, 2, 3, 4 }; 
-         var anterior = 0; 
-         foreach (var item in lista) { 
-             WriteLine($"Soma o atual e anterior { anterior + item }"); 
-             anterior = item; 
-         } 
-     } 
- } 
-   
- //https://pt.stackoverflow.com/q/271540/101 
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