22885
This study concentrates specifically on rare - earth phosphate glasses , ( R2O3 ) x ( R ' 2O3 ) y ( P2O5 ) 1 - ( x + y ) , where ( R , R ' ) denotes ( Ce , Er ) or ( La , Nd ) co - doping and the total rare - earth composition corresponds to a range between metaphosphate , RP3O9 , and ultraphosphate , RP5O14 .
 Chemical: rare - earth phosphate; Chemical: ( R2O3 ) x ( R ' 2O3 ) y ( P2O5 ) 1 - ( x + y ); Chemical: Ce; Chemical: Er; Chemical: La; Chemical: Nd; Chemical: rare - earth; Chemical: metaphosphate; Chemical: RP3O9; Chemical: ultraphosphate; Chemical: RP5O14
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: rare - earth phosphate, ( R2O3 ) x ( R ' 2O3 ) y ( P2O5 ) 1 - ( x + y ), Ce, Er, La, Nd, rare - earth, metaphosphate, RP3O9, ultraphosphate, RP5O14 
Answer:
 Chemical: rare - earth phosphate; Chemical: ( R2O3 ) x ( R ' 2O3 ) y ( P2O5 ) 1 - ( x + y ); Chemical: Ce; Chemical: Er; Chemical: La; Chemical: Nd; Chemical: rare - earth; Chemical: metaphosphate; Chemical: RP3O9; Chemical: ultraphosphate; Chemical: RP5O14