  Dear R Users! 
  I have a dataframe with duplicate cases. Var1 duplicated by var2.   
   	 	 	 	 	 	 	 		 			var1 		 		 			var2 		 		 			var3 		 		 			var4 		 		 			var5 		 		 			var6 		 	 	 		 			1 		 		 			4 		 		 			500 		 		 			1 		 		 			2 		 		 			a 		 	 	 		 			1 		 		 			3 		 		 			200 		 		 			2 		 		 			5 		 		 			b 		 	 	 		 			1 		 		 			8 		 		 			125 		 		 			1 		 		 			9 		 		 			b 		 	 	 		 			2 		 		 			2 		 		 			120 		 		 			2 		 		 			52 		 		 			b 		 	 	 		 			2 		 		 			9 		 		 			400 		 		 			1 		 		 			22 		 		 			c 		 	 	 		 			2 		 		 			6 		 		 			22 		 		 			1 		 		 			22 		 		 			d 		 	 	 		 			3 		 		 			1 		 		 			60 		 		 			1 		 		 			54 		 		 			s 		 	 	 		 			3 		 		 			2 		 		 			65 		 		 			1 		 		 			21 		 		 			c 		 	 	 		 			3 		 		 			3 		 		 			62 		 		 			1 		 		 			36 		 		 			a 		 	 	 		 			4 		 		 			3 		 		 			63 		 		 			1 		 		 			32 		 		 			a 		 	  
  I want to delete duplicate ones from var1 which have low rank at var2, and keep that case which has highest rank at var2. I would like to keep the Whole row (with the other variables: 
   	 	 	 	 	 	 	 		 			var1 		 		 			var2 		 		 			var3 		 		 			var4 		 		 			var5 		 		 			var6 		 	 	 		 			1 		 		 			8 		 		 			125 		 		 			1 		 		 			9 		 		 			b 		 	 	 		 			2 		 		 			9 		 		 			400 		 		 			1 		 		 			22 		 		 			c 		 	 	 		 			3 		 		 			3 		 		 			62 		 		 			1 		 		 			36 		 		 			a 		 	 	 		 			4 		 		 			3 		 		 			63 		 		 			1 		 		 			32 		 		 			a 		 	  
  Thanks Ag

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