QUIZ_RULE_REFERENCED_QUESTION = "REFERENCED_QUESTION"
QUIZ_RULE_QUERY_QUESTION = "QUERY_QUESTION"
QUIZ_RULE_EXACT_QUESTION = "EXACT_QUESTION"

QUIZ_RULE_INSERT_TYPES = [QUIZ_RULE_REFERENCED_QUESTION,
                          QUIZ_RULE_QUERY_QUESTION, QUIZ_RULE_EXACT_QUESTION]