A realm may pertain-to an unknown.Logical formLearned from72 sentences. A political-leader can be an unknown.Logical formLearned from64 sentences. A common cause of aggression can be fear of an unknown.Logical formLearned from58 sentences. An unknown can be to a person.Logical formLearned from53 sentences. An one may gamble a security of the world on an unknown.Logical formLearned from53 sentences. An element may pertain-to an unknown.Logical formLearned from52 sentences. An unknown can be dark.Logical formLearned from52 sentences. Challengers may pertain-to an unknown.Logical formLearned from51 sentences. An unknown can be in a country.Logical formLearned from51 sentences. A male can be an unknown.Logical formLearned from48 sentences. A female can be an unknown.Logical formLearned from47 sentences. A bunch can be constituted-of-or-filled-with unknowns.Logical formLearned from46 sentences. A journey can be into an unknown.Logical formLearned from46 sentences. A person may fear an unknown.Logical formLearned from45 sentences. Fears may pertain-to an unknown.Logical formLearned from43 sentences.