sthebestofall/192267. html
http://www. brainyquote. com/quotes/authors/m/marcusaurelius. html
http://www. brainyquote. com/quotes/authors/d/davidhume. html
http://en. wikibooks. org/wiki/A-levelCriticalThinking
http://www. criticalthinking. org. uk/unit2/fundamentals/elementsofarguments/reasons/
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