HFU HF Underground
Loggings => Spy Numbers => Topic started by: vhavrilko on February 24, 2014, 0638 UTC
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YL w/ niner, eight, fiver, oblique, one, zero repeated then "attention" followed by 5-digit groups; "attention" said again followed by another 5 -digit group then "out" @ 1815.
via University of Twentie (Netherlands)
https://www.youtube.com/watch?v=_gxP91z0VV0