491 East Indo-European and Celtic languages
492 Afro-Asiatic languages
493 Non-Semitic Afro-Asiatic languages
494 Altaic, Uralic, Hyperborean, Dravidian languages, miscellaneous languages of south Asia
495 Languages of east and southeast Asia
496 African languages
497 North American native languages
498 South American native languages
499 Non-Austronesian languages of Oceania, Austronesian languages, miscellaneous languages
500 Natural sciences and mathematics
491 East Indo-European and Celtic languages492 Afro-Asiatic languages493 Non-Semitic Afro-Asiatic languages494 Altaic, Uralic, Hyperborean, Dravidian languages, miscellaneous languages of south Asia495 Languages of east and southeast Asia496 African languages497 North American native languages498 South American native languages499 Non-Austronesian languages of Oceania, Austronesian languages, miscellaneous languages500 Natural sciences and mathematics
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