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1 Governor George Wallace, the state's only four-term governor, was a controversial figure who vowed to maintain segregation.
2 Lincoln vetoed only four bills, particularly the Wade-Davis Bill with its harsh Reconstruction program.
3 An important example of alchemy's roots in Greek philosophy, originated by Empedocles and developed by Aristotle, was that all things in the universe were formed from only four elements: earth, air, water, and fire.
4 This win also made him the first (of only four, the next being Federer, Nadal and Djokovic respectively) male player in history to have won all four Grand Slam titles on three different surfaces (clay, grass and hard courts).
5 Andorra is one of only four European countries (together with France, Monaco, and Turkey) that have never signed the Council of Europe Framework Convention on National Minorities.
6 Linnaeus, in Species Plantarum (1753), the starting point for modern botanical nomenclature, recognized 14 genera of algae, of which only four are currently considered among algae.
7 On 22 June 2006, he became one of only four people ever to be recognized with Honorary Citizenship by the Governor General of Canada.
8 But Minsky shows (as do Melzak and Lambek) that his machine is Turing complete with only four general types of instructions: conditional GOTO, unconditional GOTO, assignment/replacement/substitution, and HALT.
9 Structured programming, canonical structures: Per the Church–Turing thesis, any algorithm can be computed by a model known to be Turing complete, and per Minsky's demonstrations, Turing completeness requires only four instruction types—conditional GOTO, unconditional GOTO, assignment, HALT.
10 Its primary symbols are only four: the directed arrow showing program flow, the rectangle (SEQUENCE, GOTO), the diamond (IF-THEN-ELSE), and the dot (OR-tie).
11 Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude).
12 Of the 252 known stable nuclides, only four have both an odd number of protons and odd number of neutrons: hydrogen-2 (deuterium), lithium-6, boron-10 and nitrogen-14. Also, only four naturally occurring, radioactive odd-odd nuclides have a half-life over a billion years: potassium-40, vanadium-50, lanthanum-138 and tantalum-180m.
13 The tours generally had fewer Tests in the 1880s and 1890s than people have grown accustomed to in more recent years, the first five-Test series taking place only in 1894–95. England lost only four Ashes Tests in the 1880s out of 23 played, and they won all the seven series contested.
14 The 1948 series ended with one of the most poignant moments in cricket history, as Bradman played his final innings for Australia in the Fifth Test at The Oval, needing to score only four runs to end with a career batting average of exactly 100.
15 The same review found that neck pain was one of only four types of pain for which a positive effect was suggested, but cautioned that the primary studies used carried a considerable risk of bias.
16 and as far south as Magan (Oman) — a region over which he reigned for purportedly 56 years, though only four "year-names" survive.
17 On the 22nd ballot, former New York governor Horatio Seymour was nominated, and the President received only four votes, all from Tennessee.
18 There are only four systems in the world that can intercept ICBMs.
19 Arkansas is one of only four states (Georgia, South Carolina, Wyoming) in the U.S. to not have any legal protection against hate crimes.
20 From 1 July 2005 the Australian Democrats lost official parliamentary party status, being represented by only four senators while the governing Liberal-National Coalition gained a majority and potential control of the Senate—the first time this advantage had been enjoyed by any government since 1980.
21 The early manuals included instructions for how to build a circuit with only four commonly available components (one transistor and three resistors) and a software routine to drive a common Teletype Model 33 machine.
22 Because his father had been awarded the prize in 1922, Bohr became one of only four pairs of fathers and sons to win the Nobel Prize in Physics.
23 Like the WHA, The American Basketball Association (1967–76) also managed to have only four of its teams merged into the National Basketball Association, and the rest of the league was forced to fold.
24 It also mandated side-band addressing, thus dropping the dual address cycle, leaving only four request types: low-priority read (0000), low-priority write (0100), flush (1010) and fence (1100).
25 Only four players from each team are allowed within the centre square (50 metres or 55 yards) at every centre bounce, which occurs at the commencement of each quarter, and to restart the game after a goal is scored.
26 A cappella has been used as the sole orchestration for original works of musical theatre that have had commercial runs Off-Broadway (theatres in New York City with 99 to 500 seats) only four times.
27 Attempting to reassert his authority, Amir Khan led a large Mughal Army to the Khyber Pass, where the army was surrounded by tribesmen and routed, with only four men, including the Governor, managing to escape.
28 Home to the nation's largest collections of gorillas and orangutans, the zoo is one of only four zoos in the U.S. to house giant pandas.
29 only four clubs have played in more Serie A seasons.
30 It is worth noticing, that in the top 100 deals by value there are only four cases of Brazilian companies acquiring a foreign company.