| http://www.w3.org/ns/prov#value | - Thus, as is shown in particular in FIGS. 5 and 6, in a plane that is normal to the mean extension axis (ZZ???), each rail 16 has an outline with an undulation preferably having a central projection that corresponds to the support portion 17 and that is designed to come to be placed under the side edges of the base 12, said central projection being flanked on either side, and more particularly at t
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