| http://www.w3.org/ns/prov#value | - Practically speaking, this would be steep enough that the swimmer can tread water without touching bottom while reaching up and placing a hand on the cliff face.Defining it more specifically than that could become problematic, getting into issues such as grade percentage (% off vertical).Another approach: A steep cliff face is a part of the natural connecting shoreline of a land mass that, in th
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