By using root explorer, I found base.apk files of each and every app I installed from Google Play Store. Those are not system app. The file size of those base.apk files are same as shown in the play store app info tab. I think those are the apk files which are downloaded to install the apps and won't affect anything if I delete them. BUT I'm not sure about that and that's why I need advice from someone who has experience about this....
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