i want to calculate most loyal customer from data set and also divide this dataset into three categories equally based on total number of customer.  the dataset attached here.   inv no,stockCode,Qty,InvDate,UnitPrice,Customer,Country  573010, 851235,6,01/12/2017,3.34,17852,US  ..  ..  ..  ..  ..  this file is .CSV and contain number of different customer.    , 
						
					
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