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G13 was a cooperative numbers station maintained by the CIA and the West German BND during the Cold War for destabilization operations. It used a German military radio variant for 2 and 9, read as “zwo” and “nuenen”. The 9 variant is ‘nuenen’ (pretty much sounds like ‘niner’). In February of 1991, the voice drastically changed. It followed mostly the same format, but emphasized some numbers such as 5 more heavily. The emission mode is unknown, but was probably USB.