public InfraNestedSimplePropLvl1(
     InfraNestedSimplePropLvl2 l2,
     int lvl1)
 {
     this.L2   = l2;
     this.Lvl1 = lvl1;
 }
 public InfraNestedSimplePropLvl1(InfraNestedSimplePropLvl2 l2, int lvl1)
 {
     L2   = l2;
     Lvl1 = lvl1;
 }