Articles in two categories one of which is the other's parent

This query is marked as a draft This query has been published by Huji.

SQL

use fawiki_p;
select p1.page_title, p2.page_title, cl2.cl_to
from categorylinks cl1
join page p1
on p1.page_id = cl1.cl_from
join page p2
on p2.page_title = cl1.cl_to
and p2.page_namespace = 14
join categorylinks cl2
on p2.page_id = cl2.cl_from
limit 10;

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