"west-to-east" | "north-to-south" | "east-to-west" | "south-to-north" | "west-to-north" | "north-to-east" | "east-to-south" | "south-to-west" | "west-to-south" | "north-to-west" | "east-to-north" | "south-to-east" | "west-to-none" | "none-to-east" | "east-to-none" | "none-to-west" | "north-to-none" | "none-to-south" | "south-to-none" | "none-to-north"