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GNU_Linux_naming_controversy, Gaborone, Gadolinium, Gal%C3%A1pagos_Islands, Galah, Galeras, Galerina, Galileo_Galilei, Gallery_of_the_Kings_and_Queens_of_England, Gallimimus, Gallium, Galveston_Hurricane_of_1900, Ganesha, Ganges_shark, Gangtok, Garage_%28dance_music%29, Garden_Gnome_Liberation_Front, Gardening, Gas_giant, Gas_metal_arc_welding, Gas_tungsten_arc_welding, Gas_turbine-electric_locomotive, Gauss%27s_law, Gaza_Strip, Gazelle, Gender, Genealogy, General_Pershing_Zephyr, Genoa, Gentoo_penguin, Geography_of_Africa, Geography_of_India, Geography_of_Ireland, Geography_of_Texas, Geology_of_Dorset, Geology_of_the_Grand_Canyon_area, Georg_Cantor, Georg_Forster, Georg_von_Boeselager, George_Byron%2C_6th_Baron_Byron, George_Eliot, George_Fox, George_H._W._Bush, George_Herbert, George_II_of_Great_Britain, George_IV_of_the_United_Kingdom, George_I_of_Great_Britain, George_Thomas_Coker, George_VI_of_the_United_Kingdom, George_V_of_the_United_Kingdom, George_W._Bush, 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Heraclius, Heraldry, Herbert_Hoover, Herbig-Haro_object, Hermann_Maier, Hern%C3%A1n_Cort%C3%A9s, Hero_of_Ukraine, Hero_of_the_Russian_Federation, Herodotus, Heron, Herrerasaurus, Herring_Gull, Hey_Jude, Hickman%27s_potentilla, High_German_consonant_shift, Hilda_of_Whitby, Himno_Nacional_Mexicano, Hindi, Hippocrates, Hiroh_Kikai, Hirohito, History_of_Alaska, History_of_Anglo-Saxon_England, History_of_Arizona, History_of_Buddhism, History_of_Burnside, History_of_Cape_Colony_from_1806_to_1870, History_of_Cape_Colony_from_1870_to_1899, History_of_Central_Asia, History_of_Earth, History_of_Greece, History_of_Greenland, History_of_Limerick, History_of_Louisville%2C_Kentucky, History_of_Miami%2C_Florida, History_of_New_Jersey, History_of_Northwest_Territories_capital_cities, History_of_Poland_%281945%E2%80%931989%29, History_of_Portugal_%281777%E2%80%931834%29, History_of_Puerto_Rico, History_of_Russia, History_of_Singapore, History_of_Solidarity, History_of_South_Africa, 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Ike_Altgens, Imagism, Income_disparity, Indian_Institutes_of_Technology, Indian_Peafowl, Indian_Railways, Indian_Standard_Time, Indian_cricket_team, Indira_Gandhi, Indium, Indo-Greek_Kingdom, Indonesian_language, Indricotherium, Inductance, Indus_River, Industrial_Revolution, Infrastructure, Inner_Hebrides, Insulin, Intel_Corporation, Intelligence, InterBase, International_Court_of_Justice, International_English, International_Red_Cross_and_Red_Crescent_Movement, International_Space_Station, Interpol, Introduction_to_special_relativity, Invasion_of_Grenada, Investment_banking, Iodine, Iranian_peoples, Iraq_War, Iraq_and_weapons_of_mass_destruction, Ireland_King_of_Arms, Irish_poetry, Irish_theatre, Iron%28III%29_chloride, Iron_Maiden, Iron_Mike, Irrigation, Isaac, Isaac_Brock, Isan, Ishango_bone, Isis, Islamic_republic, Island_Fox, Isle_of_Wight, Isles_of_Scilly, Isospin, Issyk_Kul, Istanbul, Italo_disco, Ivan_IV_of_Russia, Ivory, Ivory-billed_Woodpecker, J%C3%B3rv%C3%ADk, J%C3%B3zef_Pi%C5%82sudski, J._J._Thomson, J._K._Rowling, J._M._W._Turner, J._S._Fry_%26_Sons, Jack_Kerouac, Jackal, Jackanory, Jackdaw, Jackie_Robinson, Jacob_Riis, Jacobite_rising, Jacques-Louis_David, Jacques_Cartier, Jake_Gyllenhaal, James_Bond, James_Buchanan, James_Callaghan, James_Cook, James_D._Watson, James_Garfield, James_I_of_England, James_Joyce, James_K._Polk, James_Lovelock, James_Monroe, James_Stewart_%28actor%29, James_T._Aubrey%2C_Jr., James_Watt, Jan_Mayen, Jane_Eyre, Jane_Fonda, Japanese_grammar, Japanese_war_crimes, Japanese_yen, Jarvis_Island, Jaws_%28film%29, Jean-Jacques_Rousseau, Jean_Charles_de_Menezes, Jehovah, Jerry_Fodor, Jersey_Zoological_Park, Jesse_Owens, Jet_Set_Willy, Jet_engine, Jewellery, Jiaogulan, Jimmy_Carter, Jimmy_Wales, Joan_of_Arc, Jocelin, Joel_Brand, Johann_Pachelbel, Johann_Sebastian_Bach, Johann_Wolfgang_Goethe, Johannes_Gutenberg, Johannes_Kepler, Johannes_Ockeghem, John_A.T._Robinson, John_Adams, John_Bull_%28locomotive%29, John_Cabot, John_Calvin, John_Constable, John_Dee, John_F._Kennedy, John_F._Kennedy_assassination, John_Flamsteed, John_Henninger_Reagan, John_Howard, John_Logie_Baird, John_Marshall, John_Maynard_Keynes, John_McEnroe, John_Millington_Synge, John_Milton, John_Pershing, John_Seigenthaler%2C_Sr., John_Sentamu, John_Tyler, John_Vanbrugh, John_W._Campbell, John_W._Johnston, John_von_Neumann, Johnny_Appleseed, Johnston_Atoll, Jomsvikings, Jonah_Lomu, Jonathan_Wild, Jordanhill_railway_station, Jorge_Luis_Borges, Joseph_Haydn, Joseph_Stalin, Joseph_and_the_Amazing_Technicolor_Dreamcoat, Josephus, Juan_Sebasti%C3%A1n_Elcano, Juice, Julius_Caesar, Julius_and_Ethel_Rosenberg, July_2006_Java_earthquake, Jump_rope, Juniper_berry, Jupiter_%28mythology%29, Juvenile_delinquency, Jyllands-Posten_Muhammad_cartoons_controversy, K%C4%ABlauea, Kaffir_lime, Kakapo, Kakariki, Kansas_City%2C_Missouri, Karachi, Kargil_War, Karikkoselk%C3%A4, Karl_Benz, Karl_Popper, Kashmir_region, Katana, Katyn_massacre, Keira_Knightley, Kerala, Kestrel, Keurusselk%C3%A4, Kevin_Spacey, Khan_Wali_Khan, Khartoum, Khazars, Khudai_Khidmatgar, Kidnapped_%28novel%29, Kigali, Kigo, King_Arthur, King_Kong_%281933_film%29, King_Kong_%282005_film%29, Kingman_Reef, Kipchaks_in_Georgia, Kiribati, Kite_%28bird%29, Kitsch, Klinefelter%27s_syndrome, Knights_of_Columbus, Kochi_%28India%29, Kofi_Annan, Kohlberg%27s_stages_of_moral_development, Kolkata, Konrad_Lorenz, Kookaburra, Korea, Koryaksky, Kosovo, Krag-J%C3%B8rgensen, Krakatoa, Krazy_Kat, Krill, Krypton, Ku_Klux_Klan, Kuala_Lumpur, Kubla_Khan, Kuiper_belt, Kurt_Cobain, Kuru_%28disease%29, Kuwait, Kuwait_City, Kylie_Minogue, Kyoto_Protocol, L._S._Lowry, LANSA_Cuzco_Crash, La_Grande_Arm%C3%A9e, La_Paz, Labor_Day_Hurricane_of_1935, Ladysmith_Black_Mambazo, Lagos, Laika, Lake_Albert, Lake_Baikal, Lake_Burley_Griffin, Lake_Chad, Lake_Edward, Lake_Kariba, Lake_Kivu, Lake_Malawi, Lake_Mead, Lake_Powell, Lake_Superior, Lake_Tahoe, Lake_Tanganyika, Lake_Titicaca, Lake_Toba, Lake_Turkana, Lake_Victoria, Lake_Vostok, Lance_Armstrong, Lancia_Flaminia, Land_%28economics%29, Lanthanum, Laozi, Las_Palmas_de_Gran_Canaria, Las_Vegas%2C_Nevada, Last_Supper, Latin_alphabet, Laurence_Olivier, Laurent_Fignon, Lavender, Lawn, Lawrencium, Laws_in_Wales_Acts_1535%E2%80%931542, Layla, Lead%28II%29_nitrate, League_of_Nations, Leaning_Tower_of_Pisa, Lebanon, Leeds, Leicester, Leif_Ericson, Lemon_balm, Lemon_myrtle, Lens_%28anatomy%29, Leo_%28constellation%29, Leo_Tolstoy, Leon_Trotsky, Leonhard_Euler, Lerwick, Lesotho, Lesothosaurus, Levee_failures_in_Greater_New_Orleans%2C_2005, Lhasa, Liberal_Democrats, Library, Library_of_Alexandria, Library_of_Congress, Libreville, Liechtenstein, Lighthouse_of_Alexandria, Lighting_designer, Lightning_rod, Lilongwe, Lincoln_%28automobile%29, Lincoln_Town_Car, Lindisfarne_Gospels, Linear_algebra, Link_%28The_Legend_of_Zelda%29, Linnet, Linus_Pauling, Linus_Torvalds, Lipid, Liquid_crystal, List_of_African_countries, List_of_Archbishops_of_Canterbury, List_of_Asian_countries, List_of_Canadian_provinces_and_territories_by_area, List_of_European_Union_member_states_by_accession, List_of_European_countries, List_of_North_American_countries, List_of_Oceanian_countries, List_of_Prime_Ministers_of_the_United_Kingdom, List_of_South_American_countries, List_of_Test_cricket_triple_centuries, List_of_U.S._states_by_date_of_statehood, List_of_animal_welfare_groups, List_of_areas_in_the_National_Park_System_of_the_United_States, List_of_circulating_currencies, List_of_countries, List_of_countries_by_system_of_government, List_of_elements_by_name, List_of_essential_oils, List_of_lakes, List_of_members_of_the_Commonwealth_of_Nations_by_date_joined, List_of_minerals, List_of_particles, List_of_popes, List_of_rivers_by_length, List_of_universities_in_the_United_Kingdom, List_of_vegetable_oils, List_of_world%27s_largest_lakes, Literacy, Lithium, Lithium_aluminium_hydride, Little_Women, Liverpool_F.C., Llandudno, Llywelyn_the_Great, Local_community, Local_government_in_the_United_Kingdom, Loch_Ness, Logba_language, Logistics, Lom%C3%A9, London_Underground, London_Zoo, London_sewerage_system, Lone_Wolf_%28gamebooks%29, Long-billed_Vulture, Long-tailed_Tit, Long_pepper, Longship, Looney_Tunes, Lope_de_Barrientos, Lord%27s_Resistance_Army, Lord_Voldemort, Los_Angeles%2C_California, Lost_%28TV_series%29, Lothal, Lottie_Dod, Louis_Armstrong, Louis_Freeh, Louis_Jordan, Louis_Pasteur, Louis_XIV_of_France, Louisville%2C_Kentucky, Lovage, Love, Lucy%2C_Lady_Duff-Gordon, Ludwig_Wittgenstein, Ludwig_van_Beethoven, Luftwaffe, Lunar_eclipse, Lung_cancer, Lusaka, Luxembourg, Luxembourg_%28city%29, Lyme_disease, Lyndon_B._Johnson, Lynton_and_Barnstaple_Railway, Lyon, M%2AA%2AS%2AH_%28TV_series%29, M-10001, M-10003-6, M25_motorway, M6_motorway, MINI_%28BMW%29, Macau, Macbeth, Macbeth_of_Scotland, Machu_Picchu, Mackenzie_River, Madama_Butterfly, Madrid, Magdalena_Abakanowicz, Magellanic_Penguin, Maghreb, Maglev_train, Magna_Carta, Magnesium, Magnet, Magnetism, Magpie, Mahabharata, Mahjong, Mahmoud_Abbas, Maiasaura, Maize, Makuria, Malaria, Malaspina_Glacier, Malawi, Malcolm_III_of_Scotland, Malcolm_X, Maldives, Malta, Malwa_%28Madhya_Pradesh%29, Mamenchisaurus, Mammoth, Mammoth_Cave_National_Park, Mancala, Manchester, Mandan, Manganese, Mango, Manifest_Destiny, Manifold, Manorialism, Manuel_I_Komnenos, Mao_Zedong, Map_projection, Maputo, Marc_Pugh, Marcel_Lefebvre, Marcel_Proust, Marco_Polo, Marcus_Allen, Margaret_Sanger, Margaret_Thatcher, Margate, Margin_of_error, Marginated_Tortoise, Marie_Curie, Mario, Marjoram, Mark_Twain_House, Mark_Webber, Markup_language, Mars_Exploration_Rover, Mars_Reconnaissance_Orbiter, Marseille, Marshall_Islands, Marshall_Plan, Martello_tower, Martin_Luther, Martin_Luther_King%2C_Jr., Martin_Van_Buren, Martina_Navratilova, Marvin_Gaye, Mary_II_of_England, Mary_I_of_England, Mary_I_of_Scotland, Mary_Kingsley, Mary_Seacole, Mary_Somerville, Maseru, Mass_Rapid_Transit_%28Singapore%29, Massospondylus, Mathematical_analysis, Matilda_of_Boulogne, Matrix_%28mathematics%29, Matsuo_Bash%C5%8D, Matthew_Brettingham, Mauna_Loa, Mauritania, Mausoleum_of_Maussollos, Mauthausen-Gusen_concentration_camp, Max_Planck, Max_Weber, Maxwell%27s_equations, Maya_mythology, Mayotte, Mbabane, McFly_%28band%29, Measles, Meat, Mecca, Medal_of_Honor, Medieval_commune, Medieval_literature, Medieval_music, Mega_Man_X_%28character%29, Meitnerium, Mekong, Mendelevium, Meningitis, Menstrual_cycle, Menthol, Mercantilism, Mercia, Mercury_%28element%29, Mercury_%28planet%29, Merrimack_River, Merseburg_Incantations, Mestizo, Metallurgy, Metamorphic_rock, Meteor, Meteor_shower, Meteorological_history_of_Hurricane_Katrina, Metric_expansion_of_space, Mexico_City, Miami%2C_Florida, Michael_Faraday, Michael_Jordan, Michael_Ramsey, Michael_Woodruff, Mickey_Mantle, Microraptor, Midway_Atoll, Miguel_de_Cervantes, Mikhail_Gorbachev, Milan, Miles_Davis, Milgram_experiment, Military_dictatorship, Military_history_of_Canada, Military_history_of_France, Military_history_of_Puerto_Rico, Military_history_of_the_Soviet_Union, Milk_thistle, Milkshake, Millard_Fillmore, Milton_Keynes, Ming_Dynasty, Mini, Minimum_wage, Minmi_%28dinosaur%29, Minneapolis%2C_Minnesota, Minoan_civilization, Minstrel_show, Mir, Mirabilis_%28plant%29, Miranda_Otto, Mistle_Thrush, Mitochondrial_Eve, Mitochondrion, Mixed-breed_dog, Mixtape, Modern_history, Modernist_poetry_in_English, Mohs_scale_of_mineral_hardness, Moldovans, Mole_%28animal%29, Molybdenum, Momentum, Monaco, Monaco_Grand_Prix, Monarchies_in_the_European_Union, Monarda_didyma, Mongol_invasion_of_Central_Asia, Mongoose, Monkey, Monoclonius, Monopoly_%28game%29, Monrovia, Montevideo, Montreal_Metro, Montserrat, Monty_Python, Moon_landing, Moore%27s_Law, Moorgate, Moorhen, Morecambe_Bay, Morecambe_and_Wise, Moringa_oleifera, Mormon, Mormon_Trail, Morphine, Morris_dance, Mosaic, Mosque, Mother_Teresa, Motion_%28physics%29, Mount_Baker, Mount_Everest, Mount_Kilimanjaro, Mount_Nyiragongo, Mount_Osmond%2C_South_Australia, Mount_Pinatubo, Mount_Rainier, Mount_Rushmore, Mount_St._Helens, Mount_Unzen, Mount_Vesuvius, Mountain_Gorilla, Mozambique, Mozilla_Firefox, Mu_Arae, Muhammad_Ali, Muhammad_Ali_Jinnah, Muhammad_Iqbal, Muhammad_ibn_Musa_al-Khwarizmi, Multiculturalism, Multiple_sclerosis, Multiple_sequence_alignment, Mumbai, Mummy, Munich, Murray_River, Muscat%2C_Oman, Music_of_Albania, Music_of_Antigua_and_Barbuda, Music_of_Barbados, Music_of_Dominica, Music_of_Hawaii, Music_of_Hungary, Music_of_Italy, Music_of_Martinique_and_Guadeloupe, Music_of_New_Zealand, Music_of_Spain, Music_of_Thailand, Music_of_Trinidad_and_Tobago, Music_of_the_Bahamas, Music_of_the_Lesser_Antilles, Music_of_the_United_States, Music_of_the_trecento, Muttaburrasaurus, Myco-heterotrophy, Myers-Briggs_Type_Indicator, Myocardial_infarction, Mysticism, Myxobolus_cerebralis, Nadia_Com%C4%83neci, Nagorno-Karabakh_War, Nahuatl_language, Nairobi, 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X_Window_System_protocols_and_architecture, X_Window_core_protocol, Xanadu_House, Yagan, Yak, Yamoussoukro, Yarralumla%2C_Australian_Capital_Territory, Yeast, Yellow_River, Yellow_fever, Yellowhammer, Yellowstone_National_Park, Yemen, Yenisei_River, Yes_Minister, Yeti, Yom_Kippur_War, Yorkshire_Dales, Yotsuya_Kaidan, You%27re_Still_the_One, Ytterbium, Yugoslavia, Yungay%2C_Peru, Yuri_Gagarin, Yuri_Knorosov, Z%C3%BCrich, Zachary_Taylor, Zara_Yaqob, Zebra_shark, Zeus, Zheng_He, Ziad_Jarrah, Zimbabwe, Zinc_chloride, Zion_National_Park, Zionism, Zirconium, Zoroaster, Zuid-Gelders]
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Cold_War, Colorado_River, Columbus%252C_Ohio, Comet, Commodore_64, Compact_Disc, Computer_and_video_games, Constitutional_monarchy, Continental_crust, Copper, Coriander, Corinthian_War, Cormorant, Cornea, Creative_Commons, Cricket, Crime, Crow, Crusades, Crustacean, Cuba, Cultivar, D%25C3%25A1l_Riata, Dam, Dance, Dandelion, David_Livingstone, Delhi, Democracy, Democratic_Republic_of_the_Congo, Denver%252C_Colorado, Detroit%252C_Michigan, Diabetes_mellitus, Diamond, Diane_Keaton, Dog, Dominica, Donald_Bradman, Donald_Duck, Dorset, Double_bass, Douglas_Adams, Dove, Dover, Down_syndrome, Dr._Seuss, Drawing, Dresden, Drinking_water, Drought, Dublin, Durham, Dutch_language, Eagle, Ecology, Edmond_Halley, Edward_III_of_England, Edward_VIII_of_the_United_Kingdom, Egypt, Electric_field, Electrical_resistance, Elephant, Elizabeth_II_of_the_United_Kingdom, Elizabeth_I_of_England, Emanuel_Swedenborg, Engineering, English_poetry, Ernest_Hemingway, Essential_oil, Ethanol, Ethics, Ethiopia, 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Literature, Lithuania, Loch, London_Bridge, Los_Angeles%252C_California, Luminiferous_aether, Lutetium, M1_motorway, Macedon, Macintosh, Madagascar, Magic__The_Gathering, Magma, Mahatma_Gandhi, Malaysia, Malcolm_II_of_Scotland, Mali, Mallard, Manchester_United_F.C., Manufacturing, Mark_Antony, Mark_Twain, Mars, Martinique, Marxism, Mass_media, Material_properties_of_diamond, Mauritius, Maxwell%2527s_equations, Maya_civilization, Measurement, Medicine, Melbourne, Mendip_Hills, Mentha, Meteorology, Mexico, Miami%252C_Florida, Michelangelo, Michigan_State_University, Microscope, Milk, Mining, Minnesota, Miocene, Missouri_River, Mogadishu, Moldova, Mongolia, Montreal, Morocco, Moscow, Moss, Muhammad, Music_of_Ireland, NATO, Napoleon_I_of_France, Napoleonic_Wars, Nationalism, Natural_disaster, Navassa_Island, Nazi_Germany, Neil_Armstrong, Nepal, Netball, New_York_City, New_Zealand, Nicaragua, Nickel, Niger_River, Nigeria, Nintendo_Entertainment_System, Norfolk, Norman_conquest_of_England, 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Stoicism, Stroke, Sudan, Sugarcane, Sumatra, Summer, Sundew, Sunlight, Superman, Supermarine_Spitfire, Supply_and_demand, Sydney, Symmetry, Synthesizer, Taiwan, Tamil_people, Tank, Tantalum, Tanzania, Taoism, TeX, Tea, Technology, Thailand, Thallium, The_Bahamas, The_Beatles, The_Lord_of_the_Rings, The_Supremes, Thermodynamics, Theropoda, Thomas_Aquinas, Thomas_Edison, Thucydides, Tibet, Tiger, Tigris, Titanium, Tobacco, Tokyo, Top_of_the_Pops, Tornado, Toronto, Trade_union, Train, Tree_frog, Tribe, Trinidad_and_Tobago, Trinity, Tungsten, Tunisia, Turin, Tutsi, Tycho_Brahe, Uganda, Ultraviolet, United_Arab_Emirates, United_States_Senate, University, University_of_Cambridge, Uruguay, Vegetable, Venezuela, Victoria_of_the_United_Kingdom, Vietnam, Vietnam_War, Viking, Virgil, Virus, Visual_arts, Vitamin_C, Vitus_Bering, Volcano, Vowel, War_of_the_League_of_Cambrai, Washington%252C_D.C., Water_Buffalo, Weimar_Republic, Welding, Wernher_von_Braun, Wessex, West_Bank, West_Virginia, Western_Sahara, Wikimedia_Foundation, William_III_of_England, William_IV_of_the_United_Kingdom, William_I_of_England, William_Shakespeare, Windows_Vista, Wine, Wolfgang_Amadeus_Mozart, Woodpecker, World_Heritage_Site, Writing, X_Window_System, Xenon, Yangtze_River, York, Yttrium, Z%25C3%25BCrich, ZX_Spectrum, Zambezi, Zambia, Zebra, Zhang_Qian, Zinc, Zulu]
F2 has size 490; articles in F2 but not in F3: [17th_century, 18th_century, 4-4-0, 6th_century, 8th_century, 9th_century, Action_potential, Age_of_Enlightenment, Airbus, Aircraft, Alcohol, Algeria, Aluminium, Alzheimer%2527s_disease, American_Revolutionary_War, American_popular_music, Anatomy, Andes, Antarctica, Archaeology, Arctic, Arecaceae, Arthropod, Atom, Australia, Australian_English, Auto_racing, Babylonia, Bacteria, Baltic_Sea, Baroque, Bioinformatics, Bird_of_prey, Black_Sea, Blackcap, Board_game, Brain, Bridge, Bristol, British_Isles, Broadcasting, Brush, Brussels, Buddhism, Calcium, Cambridge, Canada, Cancer, Carbon, Caribbean_Sea, Carnivore, Caspian_Sea, Charles_I_of_England, Charles_V%252C_Holy_Roman_Emperor, Citrus, City, Civil_rights, Comics, Communism, Computer_programming, Cretaceous, Cryptography, Dallas%252C_Texas, Deity, Desert, Devonian, Earthquake, Electricity, Emirate, English_Channel, Ethnic_group, Euclid, European_Union, Fire, Fish, Flanders, Flower, French_Revolution, French_language, Frog, Fruit, Gal%25C3%25A1pagos_Islands, Glacier, Granite, Greek_mythology, Hebrew_language, Henry_III_of_England, Henry_II_of_England, Henry_VII_of_England, Herbivore, Himalayas, Honduras, Horse, Imperative_programming, Indian_Ocean, Indian_independence_movement, Indonesia, Industry, Insect, Invasion, Irish_Sea, Italian_Renaissance, Italy, Jerusalem, Jordan_River, Judaism, Karl_Marx, Kazakhstan, Landform, Laos, Libya, Linux, List_of_monarchs_in_the_British_Isles, Liverpool_and_Manchester_Railway, London, Manila, Market, Mechanical_work, Metal, Microsoft_Windows, Milky_Way, Mississippi_River, Mona_Lisa, Monarchy, Mongol_Empire, Montenegro, Moon, Nature, Neutron, Nintendo, Nitrogen, North_Korea, Old_English_language, Oligarchy, Oligocene, Oxygen, Pakistan, Papua_New_Guinea, Parliament_of_the_United_Kingdom, People%2527s_Republic_of_China, Peru, Piano, Plate_tectonics, Podcasting, Political_philosophy, Pope, Portugal, Psychology, Radio, Rail_transport, Republic_of_China, Republic_of_Ireland, Rhythm_and_blues, Rock_Pigeon, Roman_Catholic_Church, Romania, Royal_Navy, Russia, Russian_language, Rwanda, Sanskrit, Saurischia, Scientific_classification, Scouting, Season, Seed, Semiconductor, Sierra_Leone, Slavery, Snow, Somalia, Sony, South_Africa, South_China_Sea, Southern_Africa, Southern_United_States, Space_exploration, Spain, Speech_synthesis, Sport, Sri_Lanka, Star_Wars_Episode_IV__A_New_Hope, Sugar, Sumer, Switzerland, Syria, Television, The_Hitchhiker%2527s_Guide_to_the_Galaxy, Togo, Toy, Tropical_cyclone, Turkey, U.S._state, Ukraine, United_States_Constitution, United_States_dollar, Unix, Vatican_City, Vitamin, Wader, Wars_of_the_Roses, Weapon, Weather, Wikipedia, Wind, World_Health_Organization, World_War_II]
F3 has size 283; articles in F3 but not in F4: [AT%2526T, Aesthetics, Apostolic_Succession, Applied_mathematics, Aquarium, Archbishop_of_Canterbury, Asia, Astronomy, Atlantic_Ocean, Automobile, Belgium, Bird, Botany, British_Empire, Child, China, Computer_science, DNA, Denmark, Dinosaur, Earth%2527s_atmosphere, Election, Electronics, English_language, Euro, Eye, Film, Folic_acid, France, Galaxy, Game, Ghana, Greece, Guatemala, Guinea, Heat, Hinduism, History_of_the_world, Horn_of_Africa, Hubble_Deep_Field, Hungary, Igneous_rock, India, Invertebrate, Ireland, Israel, Jakarta, Japan, Jazz, John_of_England, Jurassic, Law, Liverpool, Mesopotamia, Middle_East, Musical_instrument, Myanmar, Newspaper, North_Africa, Oceania, Open_source, Painting, Programming_language, Race, Ragtime, Renaissance, River, Robert_Baden-Powell%252C_1st_Baron_Baden-Powell, Roman_Empire, Sculpture, Silicon, Socialism, Sound, South_America, Sultan, Telecommunication, Temperate, Transport, Tropics, United_Nations, Wales, Windows_2000, World_Wide_Web]
F4 has size 200; articles in F4 but not in F5: [15th_century, Animal, Animation, Austria, Bulgaria, C%25C3%25B4te_d%2527Ivoire, Chemical_element, Church_of_England, Citizenship, City_status_in_the_United_Kingdom, Civilization, Color, Convention_on_the_Rights_of_the_Child, Crystal, Currency, East_Africa, Evolution, Genetics, Geography, Gravitation, Great_Britain, Guinea-Bissau, History, Hubble_Space_Telescope, International_law, Internet, Iraq, Islam, Language, Latin, Liberal_democracy, Light, Mathematics, Matter, Microsoft, Middle_Ages, Music, Netherlands, North_America, Pacific_Ocean, Plant, Richard_I_of_England, Triassic]
F5 has size 157; articles in F5 but not in F6: [5th_century, Africa, Art, British_monarchy, Chemistry, Computer, Cyprus, Electromagnetic_radiation, Germany, International_human_rights_instruments, Money, Permian, Physics, Property, Quantity, Rome, The_Lion_King, Treaty_of_Versailles]
F6 has size 139; articles in F6 but not in F7: [19th_century, Adam_Smith, Anno_Domini, Barley, Capital, Continent, Human_rights, Mediterranean_Sea, United_States, Watch, Wave, World_War_I]
F7 has size 127; articles in F7 but not in F8: [Cereal, Clock, Country, Energy, Jesus, Nationality, Ottoman_Empire, Politics, Scotland, Sea, War]
F8 has size 116; articles in F8 but not in F9: [16th_century, Agriculture, Aristotle, Government, Ocean, United_Kingdom]
F9 has size 110; articles in F9 but not in F10: [Ancient_Greece, Corporation, Food, Seawater, Time]
F10 has size 105; articles in F10 but not in F11: [Christianity, Employment, Isaac_Newton, Water]
F11 has size 101; articles in F11 but not in F12: [Business, England, Life, Religion]
F12 has size 97; articles in F12 but not in F13: [Europe, Mythology, Organism]
F13 has size 94; articles in F13 but not in F14: [Biology, Earth]
F14 has size 92; articles in F14 but not in F15: [Planet]
F15 has size 91; articles in F15 but not in F16: [Solar_System]
F16 has size 90; articles in F16 but not in F17: [Sun]
F17 has size 89; articles in F17 but not in F18: [Star]
F18 has size 88; articles in F18 but not in F19: []

The 38 cycles:
[Culture, Anthropology, Human, Mammal, Vertebrate, Cambrian_explosion, Fossil, Mineral, Geology, Science, Society]
[Economics, Education, Family, Sociology, Globalization]
[Iran, Persian_Empire]
[United_States_House_of_Representatives, United_States_Congress]
[Cotton, Textile]
[Mustard_plant, Mustard_seed]
[Communication, Information]
[Homer, Odyssey]
[Boat, Ship]
[Universe, Cosmic_inflation]
[Soil, Soil_profile]
[Screw, Wrench]
[Actor, Drama]
[ITunes, IPod]
[Abhidhamma_Pitaka, Pali_Canon]
[Philosophy, Logic]
[Latvia, Estonia]
[Protein, Genetic_code]
[Space_Shuttle_Columbia_disaster, Space_Shuttle_Columbia]
[Whale, Dolphin]
[Tuatara, Reptile]
[Wood, Tree]
[Gull, Tern]
[Optical_telescope, Telescope]
[GNU_Project, Richard_Stallman]
[Mind, Emotion]
[Fiction, Novel]
[Black_Wildebeest, Wildebeest]
[Chimpanzee, Bonobo]
[Fossil_fuel, Coal]
[Kangaroo, Wallaby]
[Sweden, Norway]
[Meander, Oxbow_lake]
[Electric_charge, Electron]
[Cambrian, Ordovician]
[ABO_blood_group_system, Blood_type]
[Opera, Theatre]
[Real_tennis, Tennis]