namespace pop
{
    using IComparable = System.IComparable;
    using Object      = System.Object;
    using String      = System.String;
    public interface Person: IComparable
    {
        String Name        { get; set; }
        Date   DateOfBirth { get; set; }
        String PhoneNumber { get; set; }
        double Height      { get; set; }
        bool   Equals(Object pObject);
        int    GetHashCode();
        String ToString();
    }
}