https://en.wikipedia.org/w/api.php?action=help&recursivesubmodules=1

It would seem the generator list is duplicated twice

Get the list of pages to work on by executing the specified query module.

One value: allcategories, alldeletedrevisions, allfileusages, allimages, alllinks, allpages, allredirects, alltransclusions, backlinks, categories, categorymembers, deletedrevisions, duplicatefiles, embeddedin, exturlusage, fileusage, geosearch, gettingstartedgetpages, images, imageusage, iwbacklinks, langbacklinks, links, linkshere, oldreviewedpages, pageswithprop, prefixsearch, protectedtitles, querypage, random, recentchanges, redirects, revisions, search, templates, transcludedin, watchlist, watchlistraw, wikigrokrandom, allcategories, alldeletedrevisions, allfileusages, allimages, alllinks, allpages, allredirects, alltransclusions, backlinks, categories, categorymembers, deletedrevisions, duplicatefiles, embeddedin, exturlusage, fileusage, geosearch, gettingstartedgetpages, images, imageusage, iwbacklinks, langbacklinks, links, linkshere, oldreviewedpages, pageswithprop, prefixsearch, protectedtitles, querypage, random, recentchanges, redirects, revisions, search, templates, transcludedin, watchlist, watchlistraw, wikigrokrandom