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Here we uncover the ultralow frequency interlayer breathing and shear modes in few - layer MoS2 and WSe2 , prototypical layered TMDs , using both Raman spectroscopy and first principles calculations .
 Chemical: MoS2; Chemical: WSe2; Chemical: TMDs
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: MoS2; Chemical: WSe2; Chemical: TMDs