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The differences in morphologies between off - chip and on - chip self - assembly and on - chip morphological trends for different chemical conditions are explained by the interplay of top - down shear effects ( coalescence and breakup ) and bottom - up chemical forces .
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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:
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