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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Chinese Boy and Girl by Isaac Taylor Headland: Magic Blocks, one of the most ingenious, if not the most
remarkable, books I have ever seen.
A T'ao is two or any number of volumes of a book wrapped in a
single cover. In this case it was two volumes. In the inside of
the cover there was a depression three inches square in which was
kept a piece of lead, wood or pasteboard, divided into fifteen
pieces as in the following illustration.
These blocks are all in pairs except one, which is a rhomboid.
They are all exactly proportional, having their sides either
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