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More than 100,000 Americans have RP , which is caused by more than 100 different genetic mutations . This goal will never succeed , as it requires N to have the same value as N + 1 , which is impossible . Other issues on which he has been working are coalbed methane versus coal mining , which is a big concern out west , because it crosses jurisdiction over who has rights to the gas . Students are to enter each link , which is a PowerPoint Presentation . The trouble stems from the silver component of the index , which is still trading well-below historic highs .