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Labour is required for physical , and Leisure for moral improvement : from the former of these advantages the rich , and from the latter the poor , by the inevitable conditions of their respective situations , are precluded . That state of human society which approaches nearer to an equal partition of its benefits and evils should , caeteris paribus , be preferred : but so long as we conceive that a wanton expenditure of human labour , not for the necessities , not even for the luxuries of the mass of society , but for the egotism and ostentation of a few of its members , is defensible on the ground of public justice , so long we neglect to approximate to the redemption of the human race . As with DES , idea can can operate in all four modes : ECB , CBC , CFB and OFB / IDEA was designed to be efficient in both hardware and software implementations . Cyril Wecht ( 1995 ) , former president of the National Association of Forensic Pathologists , described the viscera in terms that could apply to supermarket meat scraps : " I cannot relate these structures to abdominal context . A marriage of light and electronics : the laser .