Perhaps you have heard the old tale of a woodcutter who so impressed their king that they were given the most important areas of forest to cut. In the beginning the volume of cutting was impressive. Over time that volume became less and less. The woodcutter was perplexed because they were working the same number of hours and working just as hard. Why were they cutting less? With time the axe had become dull and less effective. The woodcutter simply had to sharpen their axe and then they were once again cutting at the high volume.
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