Persons can be on a topic.Logical formLearned from387 sentences. Books can be on a topic.Logical formLearned from384 sentences. Topics can be constituted-of-or-filled-with conversation.Logical formLearned from382 sentences. A topic can be fascinating.Logical formLearned from378 sentences. A topic may pertain-to today.Logical formLearned from377 sentences. A topic can be constituted-of-or-filled-with concern.Logical formLearned from377 sentences. Topics can be taboo.Logical formLearned from375 sentences. Seminars can be on topics.Logical formLearned from374 sentences. Topics may be listed.Logical formLearned from373 sentences. Interest can be in a topic.Logical formLearned from372 sentences. A person may post topics.Logical formLearned from366 sentences. A person may have on a topic.Logical formLearned from356 sentences. Interest can be in a topic.Logical formLearned from355 sentences. A topic may pertain-to a meeting.Logical formLearned from350 sentences. An article can be on a topic.Logical formLearned from346 sentences.