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But there is only two of it for such time as one goes back in time once more. Hence, in this part of the timeline, there has always been two of it, and along with the action of going back in timefor a set peiod anyway, the difference has already been compensated for.
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Okay, after the time it goes back, there is only one. However, this going back can happen an unlimited number of times, and can also happen with virtual photons. Read
How to build a time machine by Paul Davies.