| http://www.w3.org/ns/prov#value | - When it is hot you are sweating, and sweating you do most on your feet' soles.I do not know how it is with other people, but in my experience the mixture of sweat and bare foot on the shoe's footbed and movement i.e. walking leads to the formation of a kind of "sludge made from abraised callus, textile fibre and sweat.
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