3451
Various situations , including the " bipolar electrode " shown in the figure , are considered and the difference between the behavior in electrochemical metallization memories ( ECMs ) and valence change memories ( VCMs ) outlined .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None