Some books can be on a subject.Logical formLearned from989 sentences. Subjects can be sensitive.Logical formLearned from984 sentences. Human subjects may undergo protection.Logical formLearned from962 sentences. A subject may undergo an understanding.Logical formLearned from949 sentences. Subjects can be controversial.Logical formLearned from946 sentences. A subject may pertain-to a post.Logical formLearned from943 sentences. A subject may come_up.Logical formLearned from929 sentences. Books can be on a subject.Logical formLearned from910 sentences. Knowledge may pertain-to a subject.Logical formLearned from873 sentences. A subject may undergo a treatment.Logical formLearned from837 sentences. Subjects may be covered.Logical formLearned from793 sentences. A subject can be constituted-of-or-filled-with discussion.Logical formLearned from784 sentences. Research may involve human subjects.Logical formLearned from769 sentences. A subject may pertain-to an article.Logical formLearned from768 sentences. A subject can be constituted-of-or-filled-with interest.Logical formLearned from757 sentences.