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 _    _      ___      _  _     _____     _____   
| || | ||   / _ \\   | \| ||  |  ___||  |__  //  
| || | ||  / //\ \\  |  ' ||  | ||__      / //   
| \\_/ || |  ___  || | .  ||  | ||__     / //__  
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Text this: The Fermi-Pasta-Ulam problem : a status report