• docid_order : Xapian::Enquire
• e_action : action
• e_assoc : symbol
• e_state : pstate
• feature_flag : Xapian::QueryParser
• flags : Xapian::TermGenerator
• op : Xapian::Query
• reason : FlintLock
• sort_setting : Xapian::Enquire::Internal
• stem_strategy : Xapian::QueryParser
• test_result : test_driver

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