A truth can be before unknown.Logical formLearned from5 sentences. An unknown may undergo an investigation.Logical formLearned from5 sentences. A gate can be into an unknown.Logical formLearned from5 sentences. An unknown can be wide.Logical formLearned from5 sentences. Dread may pertain-to an unknown.Logical formLearned from5 sentences. Tension may pertain-to an unknown.Logical formLearned from5 sentences. Unknown may mean that something-is-the-case.Logical formLearned from5 sentences. A source can be constituted-of-or-filled-with unknown.Logical formLearned from5 sentences. An unknown can be to a male.Logical formLearned from5 sentences. Some leap can be into an unknown.Logical formLearned from5 sentences. Equations can be with some unknowns.Logical formLearned from5 sentences. Some linear equations can be in some unknowns.Logical formLearned from5 sentences. A person may explore an unknown.Logical formLearned from5 sentences. An unknown can be terrifying.Logical formLearned from5 sentences. A growth of a child can be in a realm of an unknown.Logical formLearned from5 sentences.