10580
While not fully developed , a first - order thermodynamic analysis based upon the Gibbs free energies of formation of the various SRO structural units in this system has been developed and can be used to account for the preferential formation of tetrahedral boron groups , B ( 4 ) , by the reaction of B ( 3 ) with P ( 2 ) groups to form B ( 4 ) and P ( 3 ) groups , respectively , where the superscript denotes the number of BOs on these units , in these glasses .
 boron, B, B, P, B, P
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 boron, B, B, P, B, P