public override string execute(Blackfin bf, string[] args)
 {
     try
     {
         if (!bf.GetLastNCounts(uint.Parse(args[0])))
         {
             return(null);
         }
         return(PrintCountsList(bf.Counts));
     }
     catch (FormatException)
     {
         throw new CommandArgumentException("Incorrect n argument");
     }
 }