18141
Of the 22 metals tested , 10 show a M - Cu oxide with higher photoactivity than CuO and 10 show a Bi - M - Cu oxide with higher photoactivity than CuBi2O4 .
 Chemical: Cu oxide; Chemical: CuO; Chemical: Bi; Chemical: Cu; Chemical: oxide; Chemical: CuBi2O4
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: Cu oxide; Chemical: CuO; Chemical: Bi; Chemical: Cu; Chemical: oxide; Chemical: CuBi2O4