public void Run()
{
C1 c1 = new C1();
string c1_name = c1.GetNmae(); //C1.virtual
C2 c2 = new C2();
string c2_name = c2.GetNmae(); //C2.override
C3 c3 = new C3();
string c3_name = c3.GetNmae(); //C1.virtual
C1 c12 = new C2();
string c12_name = c12.GetNmae(); //C2.override
C1 c13 = new C3();
string c13_name = c13.GetNmae(); //C1.virtual
C1 c42 = new C42();
string c42_name = c42.GetNmae();//C2.override
C5 c5 = new C5();
string c5_name = c5.GetNmae();//C0
}