A Naked Quad is rarer, especially in its full form but still useful if they can be spotted. The same logic from Naked Triples applies.
We have a Naked Quad arranged nicely together in the top row. Because we have 2/4/7/8 in columns 3, 4, 5 and 6 (marked in green circles) we can clear all other occurrences from the row (marked in red squares).
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