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21Context-free grammar — In formal language theory, a context free grammar (CFG) is a formal grammar in which every production rule is of the form V → w where V is a single nonterminal symbol, and w is a string of terminals and/or nonterminals (w can be empty). The… …
22Platypus — For other uses, see Platypus (disambiguation). Platypus[1] Temporal range: 66–0 Ma …
23List of trigonometric identities — Cosines and sines around the unit circle …
24Waiting for Godot — Infobox Play name = Waiting for Godot image size = 200px writer = Samuel Beckett characters = Estragon Vladimir Lucky Pozzo Boy date of premiere = January 5th, 1953 Waiting for Godot is a play by Samuel Beckett, in which two characters wait for… …
25William III of England — William III II William III by Sir Godfrey Kneller Prince of Orange Reign 4 November 1650 …
2647 BC — NOTOC Year 47 BC was a year of the pre Julian calendar.EventsBy placeRome*Consuls: Quintus Fufius Calenus, Publius Vatinius. *Civil War: **February Roman general Julius Caesar and his ally Cleopatra VII of Egypt defeat the forces of the rival… …
27Philip II of Macedon — Infobox Monarch name =Philip II title =Basileus of Macedon caption =Victory medal (niketerion) struck in Tarsus, 2nd c. BC (Cabinet des Médailles, Paris) reign =359 BC – 336 BC coronation = othertitles = full name = native lang1 = Greek native… …
28The Art of War — (zh cp|c=|p=Sūn Zǐ Bīng Fǎ) is a Chinese military treatise that was written during the 6th century BC by Sun Tzu. Composed of 13 chapters, each of which is devoted to one aspect of warfare, it has long been praised as the definitive work on… …
29Alfalfa — This article is about plant and flower. For the actor and character of the series Our Gang, see Carl Alfalfa Switzer. For the community in Central Oregon, see Alfalfa, Oregon. Alfalfa Medicago sativa …
30Cryptic crossword — Cryptic crosswords are crossword puzzles in which each clue is a word puzzle in and of itself. Cryptic crosswords are particularly popular in the United Kingdom, where they originated, Ireland, the Netherlands, and in several Commonwealth nations …
