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  "method": "All offered positions counted, including optional and dropped items. Response format and question structure are separate dimensions. Structures are exclusive by precedence assertion–reason > matching > statements > other. Passage/comprehension is an additional overlapping flag. One primary historical chapter allocation per question, with secondary tags for mixed concepts. Question shares are not marks shares. Format/structure and chapter tags are editorial classifications, not official statistics or external subject-expert certification."
}
