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                 A blank value indicates that either: 
                
                  - The school or district is new in the year selected
 
                  - The school or district has no students enrolled in that grade level in the year selected
 
                  - The school or district has no grade in the year selected for students from the previous year to advance
 
                  - The data is suppressed because the enrollment total is less than 6.
 
                  
                A value of zero indicates that there was no attrition in that grade for the year and student group selected.
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