20713
Detailed comparisons between the available experimental and computed AEA data at the B3LYP / 6 - 311 + G * level identified the electronic ground state of ( 5 ) Delta for FeS , ( 4 ) Delta for FeS ( - ) , ( 5 ) B2 for FeS2 , ( 6 ) A1 for FeS2 ( - ) , ( 1 ) A1 for Fe2 S2 , ( 8 ) A ' for Fe2 S2 ( - ) , ( 5 ) A ' ' for Fe3 S4 , ( 6 ) A ' ' for Fe3 S4 ( - ) , ( 1 ) A1 for Fe4 S4 , and ( 1 ) A2 for Fe4 S4 ( - ) .
 Chemical: FeS; Chemical: FeS ( - ); Chemical: FeS2; Chemical: FeS2 ( - ); Chemical: Fe2 S2; Chemical: Fe2 S2 ( - ); Chemical: Fe3 S4; Chemical: Fe3 S4 ( - ); Chemical: Fe4 S4; Chemical: Fe4 S4 ( - )
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: FeS; Chemical: FeS ( - ); Chemical: FeS2; Chemical: FeS2 ( - ); Chemical: Fe2 S2; Chemical: Fe2 S2 ( - ); Chemical: Fe3 S4; Chemical: Fe3 S4 ( - ); Chemical: Fe4 S4; Chemical: Fe4 S4 ( - )