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This predicate is a reified constraint : it succeeds if and only if the truth value of its associated constraint ( the constraint with arity one less and the same arguments except for B ) is equal to B , where the value 0 means false and 1 true . Since then , the country has extended its agricultural frontiers to grow GE soya for export as animal feed , at the expense of its threatened forests , wildlife and the homes and livelihoods of many people . This predicate is an evaluation constraint : it succeeds if and only if the truth value of its associated constraint ( the constraint with arity one less and the same arguments except for B ) is equal to B , where the value 0 means false and 1 true . The practice of jumping from the Mathematical Bridge seems to have become standard by the early 1960 's , partly as a result of its deemed aptness and partly owing to an unfortunate leg injury resulting from a previous attempt to jump from Garret Hostel Bridge ( which has a high span and only shallow water beneath it ) . The Center for Family Care announces the launch of its improved website .