Hi,    I have this querry...    i have a dataset like this and i want to flag it where i have consecutive values.      data bob;   input subjid lbtestcd$ lbdy flag1$;  datalines;  101 alt 1 e  101 alt 2 .  101 alt 3 e  101 alt 4 e  101 ast 1 e  101 ast 3 e  101 ast 4 .  101 ast 5 e  102 alt 1 e  102 alt 2 .  102 alt 3 e  102 alt 4 e  102 ast 1 e  102 ast 3 e  102 ast 4 .  102 ast 5 e  102 ast 6 e  ;  run;      i want an output like   i want to flag consecutive 'e' values for consecutive visits by subject and test.      could you please help me out      thanks.      
						
					
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