13151
Central to this method is a thermally activated chemical reaction occurring across multiple interfaces between alternately layered elemental zinc - ( Zn - ) and selenium - ( Se - ) rich films embedded in a preform and drawn into meters of fiber at a temperature well below the melting temperature of either Zn or ZnSe .
 Chemical: zinc; Chemical: Zn; Chemical: selenium; Chemical: Se; Chemical: Zn; Chemical: ZnSe
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: zinc; Chemical: Zn; Chemical: selenium; Chemical: Se; Chemical: Zn; Chemical: ZnSe