public Mantle(IDrillBit drillBit, ILayer nextLayer)
{
_drillBit = drillBit;
_nextLayer = nextLayer;
}
public Core(IDrillBit drillBit)
{
_drillBit = drillBit;
}
public Crust(IDrillBit drillBit, ILayer nextLayer)
{
_drillBit = drillBit;
_nextLayer = nextLayer;
}
