#example-1-a-white-noise" class="nav-link">Example 1: a white noise</a>
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            <li class="nav-item" data-level="3"><a href="#example-2-lowpass" class="nav-link">Example 2: lowpass</a>
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            <li class="nav-item" data-level="3"><a href="#example-3-high-pass" class="nav-link">Example 3: high pass</a>
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