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Briefing:

"Hello, hello, Can you hear me, as I scream your Flag! " file

Opening the file in sonic visualiser, you can see two audio streams. Seaparete the streams and then add a spectogram layer. Play around with the colour settings to see the flag more clearly.

Flag:

darkCTF{1_l0v3_5p3ctr3_fr0m_4l4n}