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C October,B00C
Dear Mr. Harold,
It is a month since ......

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Many man-made substances are replacing certain natural materials because either the quantity of the natural product can ’not meet our ever-increasing requirement, or, more often, because the physical property of the synthetic substance, which is the common name for man-made materials, has been chosen so that it would be of the greatest use in the fields in which it is to be applied.
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