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Exercise solution:
A generic Pair class

Here is the class Pair<S,T>:

using System;

public class Pair<T,S>{
  private T first;
  private S second;

  public Pair(T first, S second){
    this.first = first; this.second = second;

  public T First{
     get {return first;}

  public S Second{
     get {return second;}