7650
The electrical conductivity measurement was employed to investigate the microregions of the single - phase microemulsion region , and three different microregions , that is , water - in - oleic acid ( W / O ) , a bicontinuous ( B . C . ) region , and oleic acid - in - water ( O / W ) , were identified , which were further confirmed by freeze - fracture and cryogenic transmission electron microscopy ( FF - TEM and Cryo - TEM ) observations .
 Chemical: oleic acid; Chemical: oleic acid
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: oleic acid; Chemical: oleic acid