CLASS brd
	CLASS brd$a Type
		FIELD a WORLD_SURFACE_WG Lbrd$a;
		FIELD b OCEAN_FLOOR_WG Lbrd$a;
		FIELD c MOTION_BLOCKING Lbrd$a;
		FIELD d MOTION_BLOCKING_NO_LEAVES Lbrd$a;
		FIELD e OCEAN_FLOOR Lbrd$a;
		FIELD f WORLD_SURFACE Lbrd$a;