Welcome, Again, to the Nostradamus Server!

I am impressed! Your guess that my number begins with 640000715 was exactly right!
What do you guess are the next two digits of my number?
64000071500
64000071501
64000071502
64000071503
64000071504
64000071505
64000071506
64000071507
64000071508
64000071509
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