public Suggest(user au, string bo) : base(au, null, bo) { }
public Article(user au, string ti, string bo, DateTime me) : base(au, ti, bo) { Time = me; }
public Problem(user au) : base(au, " ", " ") { }
public Problem(user au, string ti, string bo) : base(au, ti, bo) { }
public Max(user au, string ti, string bo) { Authors = au; Title = ti; Body = bo; }