13876
The Fe - - - Fe bond elongates to 2 . 80 from 2 . 66 A , but the Fe - P bonds only change subtly .
 Chemical: Fe - - - Fe; Chemical: Fe - P
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: Fe - - - Fe; Chemical: Fe - P