45143
It is widely used in materials such as GaAs , AlGaAs , InGaAs and InAlAs grown by molecular beam epitaxy ( MBE ) .
 location: GaAs; location: AlGaAs; location: InAlAs
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: GaAs, AlGaAs, InAlAs 
Answer:
 location: GaAs; location: AlGaAs; location: InAlAs