13225
The effect of the ring size is studied by looking at some well known aromatic and anti - aromatic molecules of different sizes , showing that the linear response is capable of correctly classifying and quantifying the aromaticity for five - to eight - membered aromatic and anti - aromatic molecules .
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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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