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| \  / ||   / _ \\   | \| ||   / _ \\   /_   _// 
|  \/  ||  / //\ \\  |  ' ||  | / \ ||    | ||   
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`-`  `-`  `-`   `-`  `-` -`    `---`    `--`

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Text this: Modeling, validation, and performance of low-frequency piezoelectric energy harvesters