CLASS can net/minecraft/structure/pool/StructurePoolElementType
	FIELD b SINGLE_POOL_ELEMENT Lcan;
	FIELD c LIST_POOL_ELEMENT Lcan;
	FIELD d FEATURE_POOL_ELEMENT Lcan;
	FIELD e EMPTY_POOL_ELEMENT Lcan;
	METHOD a register (Ljava/lang/String;Lcan;)Lcan;