9240
Tungsten carbide nanocrystals ( =~ 5 nm ) are directly synthesized through the reaction of tungsten precursors with mesoporous graphitic C ( 3 ) N ( 4 ) ( mpg - C ( 3 ) N ( 4 ) ) as the reactive template in a flow of inert gas at high temperatures .
 Chemical: Tungsten carbide; Chemical: tungsten; Chemical: C ( 3 ) N ( 4 ); Chemical: C ( 3 ) N ( 4 )
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Tungsten carbide, tungsten, C ( 3 ) N ( 4 ), C ( 3 ) N ( 4 ) 
Answer:
 Chemical: Tungsten carbide; Chemical: tungsten; Chemical: C ( 3 ) N ( 4 ); Chemical: C ( 3 ) N ( 4 )