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The effects of ultrasound irradiation , concentration , pH and sequential dipping steps on growth of the Mg ( OH ) ( 2 ) nanostructures have been studied .
 Chemical: Mg ( OH ) ( 2 )
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: Mg ( OH ) ( 2 )