CLASS btm net/minecraft/world/gen/carver/Carver
	FIELD a CAVE Lbtm;
	FIELD b NETHER_CAVE Lbtm;
	FIELD c RAVINE Lbtm;
	FIELD d UNDERWATER_RAVINE Lbtm;
	FIELD e UNDERWATER_CAVE Lbtm;
	FIELD f AIR Lbpm;
	FIELD g CAVE_AIR Lbpm;
	FIELD h WATER Lcfd;
	FIELD i LAVA Lcfd;
	METHOD a register (Ljava/lang/String;Lbtm;)Lbtm;