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The unique core - shell morphology is likely due to the enrichment of Co ( iii ) hydroxide in the inner core indicated by selected area electron diffraction and energy - dispersive spectroscopy .
 Co ( iii ), hydroxide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Co ( iii ), hydroxide