References can be to sections.Logical formLearned from28 sentences. References can be open.Logical formLearned from28 sentences. Reference can be to a program.Logical formLearned from28 sentences. A (reference collection) may pertain-to a person.Logical formLearned from28 sentences. A (reference point) can be obvious.Logical formLearned from28 sentences. References can be to functions.Logical formLearned from28 sentences. Reference can be to a topic.Logical formLearned from28 sentences. Reference can be to principles.Logical formLearned from28 sentences. A book may be used as a reference.Logical formLearned from28 sentences. Reference can be to management.Logical formLearned from28 sentences. A female can be (reference librarian).Logical formLearned from28 sentences. A reference can be to the past.Logical formLearned from28 sentences. References can be to subjects.Logical formLearned from28 sentences. Inertial frames can be constituted-of-or-filled-with reference.Logical formLearned from28 sentences. Reference can be to desire.Logical formLearned from28 sentences.