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RxJava3
implementation "io.reactivex.rxjava3:rxjava:3.0.0"//rxjava
implementation 'io.reactivex.rxjava3:rxandroid:3.0.0'//rxAndroid
RxJava2
implementation 'io.reactivex.rxjava2:rxjava:2.2.21'
implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'