user: Describe Index – B from the Blender manual or Python API, including usage steps and snippets.

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[(bpy.types.BlendDataArmatures class method)](bpy.types.BlendDataArmatures.html#bpy.types.BlendDataArmatures.bl_rna_get_subclass_py)   - [(bpy.types.BlendDataBrushes class method)](bpy.types.BlendDataBrushes.html#bpy.types.BlendDataBrushes.bl_rna_get_subclass_py)   - [(bpy.types.BlendDataCacheFiles class method)](bpy.types.BlendDataCacheFiles.html#bpy.types.BlendDataCacheFiles.bl_rna_get_subclass_py)   - [(bpy.types.BlendDataCameras class method)](bpy.types.BlendDataCameras.html#bpy.types.BlendDataCameras.bl_rna_get_subclass_py)   - [(bpy.types.BlendDataCollections class method)](bpy.types.BlendDataCollections.html#bpy.types.BlendDataCollections.bl_rna_get_subclass_py)   - [(bpy.types.BlendDataCurves class method)](bpy.types.BlendDataCurves.html#bpy.types.BlendDataCurves.bl_rna_get_subclass_py)   - [(bpy.types.BlendDataFonts class method)](bpy.types.BlendDataFonts.html#bpy.types.BlendDataFonts.bl_rna_get_subclass_py)   - [(bpy.types.BlendDataGreasePencilsV3 class method)](bpy.types.BlendDataGreasePencilsV3.html#bpy.types.BlendDataGreasePencilsV3.bl_rna_get_subclass_py)   - 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