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ringtone notification mp3 file shrink

 -keep class **.R$raw { *; }

-keepclassmembers class **.R$raw { *; }
-keep raw/ring.mp3

-keepclassmembers class **.R$* {
    public static final int raw_*;
}
-keepdirectories res/raw/ring.mp3

-keepclassmembers class ** {
    public static final int raw_*;
}

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