Subcategories en.wikipedia.org Leiden
Fetch pages from en.wikipedia.org for category Leiden, max 9 levels deep:

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1 Leiden -> 11 subcats, 13 articles
    2 Buildings and structures in Leiden -> 1 subcat, 16 articles
        3 Museums in Leiden -> 9 articles
    2 Burials in Leiden -> 1 subcat, 1 article
        3 Burials at Pieterskerk, Leiden -> 21 articles
    2 Culture in Leiden -> 2 articles
    2 Economy of Leiden -> 1 subcat, 2 articles
        3 Companies based in Leiden -> 1 article
    2 History of Leiden -> 1 subcat, 5 articles
        3 Members of the Leiden Guild of Saint Luke -> 30 articles
    2 Leiden University -> 3 subcats, 21 articles
        3 Leiden University alumni -> 17 articles
        3 Leiden University faculty -> 1 subcat, 236 articles
            4 Professorships at Leiden University -> 1 article
        3 Manuscripts of Leiden University Library -> 2 articles
    2 Media in Leiden -> 3 articles
    2 Parks in Leiden -> 1 article
    2 People from Leiden -> 2 subcats, 268 articles
        3 Aldermen of Leiden -> 6 articles
        3 Members of the Leiden Guild of Saint Luke -> already queried
    2 Rijksmonuments in Leiden -> 7 articles
    2 Sport in Leiden -> 1 article

21 unique categories scanned, with in total 972 unique articles (namespace 0), in 3 seconds.