| http://www.w3.org/ns/prov#value | - In addition, it is noted that the sole 115 illustrated in the preferred implementations undulates along its length, so that the region of the sole 115 that is configured to underlie the heel region 670 of the foot 600 is slightly elevated relative to anterior regions of the sole 115, such as the region of the sole 115 that is configured to underlie the toe region 660.
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