The above diagram is intended to get the idea across and to whet the appetite for more.  To protect the copyright, only three of the original four columns are illustrated here, and the notes on lines linking verses in various gospels have been erased.  Students and readers are encouraged to acquire A Diagram of Synoptic Relationships from Amazon.com, any reliable bookstore, or direct from the publisher, T&T Clark / The Continuum Group, 80 Maiden Lane, Suite 704, New York, NY10038 or at www.continuumbooks.com