CLASS bpp
	CLASS bpp$a
		FIELD a WORLD_SURFACE_WG Lbpp$a;
		FIELD b OCEAN_FLOOR_WG Lbpp$a;
		FIELD c LIGHT_BLOCKING Lbpp$a;
		FIELD d MOTION_BLOCKING Lbpp$a;
		FIELD e MOTION_BLOCKING_NO_LEAVES Lbpp$a;
		FIELD f OCEAN_FLOOR Lbpp$a;
		FIELD g WORLD_SURFACE Lbpp$a;