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I think it is a nice idea and the best part is that it can be overlapped and that is not a time waster for sure. I can see this as being a good checksum while confirming planets.
Although there could be a problem with this in this as we develop more space telescopes are being used and the same would occur with any other advanced species. I am sure everyone can agree that most people see that our technology span is very short with difficult observation results and space telescope without laser requirements could be more common within a very short period of time.
The concept though is sound and definitely worth the really small amount of work required to observe this.
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