8232
The chirality of the SiGe / Si / Cr helices with isotropic Young ' s moduli is governed by the anisotropic underetching in the initial stage , which can be precisely judged , as the orientation of the ribbon is predesigned .
 Chemical: SiGe; Chemical: Si; Chemical: Cr
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: SiGe; Chemical: Si; Chemical: Cr