30650
Unlike conventional associative memories where charge retention is a key function and hence , they require frequent refresh cycles , in ACNs , information is retained in a nonvolatile resistive state and normal tasks are carried out through capacitive coupling between input and output nodes .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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