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The objects can be complex in that they may be composed of multiple layers with different refractive indices .
 part of: multiple layers, they; feature of: refractive indices, multiple layers
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 part of: multiple layers, they; feature of: refractive indices, multiple layers