D channel

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D channelD channelD channelD channelD channelD channel
D channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channelD channel