"Mobile developers will have the option to use their own billing systems in their app alongside Google Play’s billing, or they can guide users outside of their app to their own websites for purchases. Our goal is to offer this flexibility in a way that maximizes choice and safety for users."
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，这一点在纸飞机下载中也有详细论述
1. 找出最大数，确定最大位数d，详情可参考91视频
Added the description about the "cleaning up indexes" phase in Section 6.1.。PDF资料是该领域的重要参考
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