public GVoid(NearDifference nearShift, FarDifference farShift) : base(nearShift, farShift) { }
protected GroupCommand(NearDifference nearShift, FarDifference farShift) { NearShift = nearShift; FarShift = farShift; }
public GFill(NearDifference nearShift, FarDifference farShift) : base(nearShift, farShift) { }