| http://www.w3.org/ns/prov#value | - USING IT IS EASIER THAN IT SEEMS. In practice (a) you install an app on an iPhone, Android, or other device, which keeps generating authentication codes even if you have no cell phone signal at all, and (b) Once every 30 days (in some circumstances, only one time, ever) you enter that code on your computer to verify your identity to Gmail.
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