How to read the association rules to find clustered items?

Hi everyone
I have understood how the Apriori algorithm works and how we acquire the association rules. But, I still haven’t figured out how to understand or read the association rules to cluster the items that are to be placed together. If you read this article

in that in the end, I do not understand how milk, eggs and vegetables are placed together based on the association rules found?

I kindly request someone to explain this to me.

Thanks.

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