puzzle of the week - the 10 penny circle packing puzzle

Have you heard of the Ten Penny Puzzle? It is a style of brain teaser known as a circle packing puzzle. Wikipedia does a pretty good job of explaining just what that means:

"In geometrycircle packing is the study of the arrangement of circles (of equal or varying sizes) on a given surface such that no overlapping occurs and so that no circle can be enlarged without creating an overlap."

The Ten Penny Puzzle is not one to push the limits in

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