CREATE TABLE table_name_73 (school_year VARCHAR(255), class_aAA VARCHAR(255), dalhart VARCHAR(255), class_aAAAA VARCHAR(255), edinburg VARCHAR(255))
Which school year was the Class AAA dalhart and the class AAAAA edinburg?
    
SQL: SELECT school_year FROM table_name_73 WHERE class_aAA = dalhart AND class_aAAAA = edinburg