14762
An annealing duration of 30 min at 200 degrees C in a low vacuum environment reveals that the voids are not uniformly distributed at the Cu / Cu oxide interface .
 Chemical: Cu; Chemical: Cu oxide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Cu; Chemical: Cu oxide