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