A tradition may undergo a disappearance.Logical formLearned from6 sentences. A lander may undergo a disappearance.Logical formLearned from6 sentences. A convention may define forced disappearances.Logical formLearned from6 sentences. Circumstances of a disappearance can be unknown.Logical formLearned from6 sentences. Scientists may undergo disappearances.Logical formLearned from6 sentences. Detectives may investigate a disappearance.Logical formLearned from6 sentences. Cash may undergo a disappearance.Logical formLearned from6 sentences. Militants may undergo a disappearance.Logical formLearned from6 sentences. Persons may read about disappearances.Logical formLearned from6 sentences. A disappearance may pertain-to someone.Logical formLearned from6 sentences. A permafrost may undergo a disappearance.Logical formLearned from6 sentences. A disappearance can be modern-day.Logical formLearned from6 sentences. A reason can be for disappearances.Logical formLearned from6 sentences. (Newspaper articles) can be about a disappearance.Logical formLearned from6 sentences. An international system may undergo a disappearance.Logical formLearned from6 sentences.