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• Copyright 1991,1996, 1997, 1998 John Richard Coffey.
• Please use the links below to center the problems, and to advance to the next diagram.
• These diagrams are best viewed in 640x480 graphics mode.
• If Internet Explorer has trouble displaying these diagrams then use the font-size button to select a smaller font and then also click the refresh button. Then if pieces should start to disappear then press the stop button and click on any pieces that are missing.

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