CLASS bdn net/minecraft/world/biome/source/FixedBiomeSource
	METHOD a (IIILjava/util/List;Ljava/util/Random;)Let;
		ARG 4 biomes
	METHOD a hasStructureFeature (Lbyn;)Z
		ARG 1 feature
	METHOD b getTopMaterials ()Ljava/util/Set;