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The recent discovery of superconductivity in iron selenide has attracted considerable attention due to the simplicity of composition , unconventional nature of superconductivity , and ease of synthesis .
 Chemical: iron selenide
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: iron selenide