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Description
Notebook title: MLDA sampler: Introduction and resources
Notebook url: https://www.pymc.io/projects/examples/en/latest/samplers/MLDA_introduction.html
Issue description
Under the "Notebooks with example code" section, the "Variance 2" (external) link is broken.
Proposed solution
If someone can find where the linked page has gone (assuming it has moved and not disappeared), then the link can be updated. Otherwise, the reference can just be omitted.