| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood and other advantages will appear on reading the description which will follow given without limitation and by virtue of the appended figures among which: FIG. 1 represents a lateral view and a view from above of the safety surface according to the prior art; FIG. 2 represents a view from above of a short-term defined safety
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