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extremely low frequency
ex·treme·ly low fre·quen·cy (plural ex·treme·ly low fre·quen·cies)


noun 
Definition:
 
frequency below 30 Hz: a radio frequency below 30 hertz
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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