public class IntCompSeq: IntSequence{

  private IntSequence s1, s2;

  public IntCompSeq(IntSequence s1, IntSequence s2) {
    this.s1 = s1;
    this.s2 = s2;
  }

  public override int? Min{
    get {return (s1.Min < s2.Min) ? s1.Min : s2.Min;}
  }

  public override int? Max{
    get {return (s1.Max > s2.Max) ? s1.Max : s2.Max;}
  }

  public override IEnumerator GetEnumerator (){
    foreach(int i in s1)
      yield return i;
    foreach(int i in s2)
      yield return i;
  }

}