Most lecturers who are good communicators are eccentric. Some noneccentric lecturers are effective teachers but are not good communicators. All good communicators are effective teachers. Some good communicators are eccentric.
Most lecturers who are effective teachers are eccentric, but some noneccentric lecturers are very effective teachers. In addition, every effective teacher is a good communicator.
Which one of the following statements follows logically from the statements above?