| http://www.w3.org/ns/prov#value | - are substantially parabolic.In a rectangular frame of reference defined by the directrix D and the axis of symmetry S, the sides 32a and 32b of each pattern 26 are thus defined by an equation of the type y=k.x2 (where y is defined along the axis S, x is defined along the axis D, and k is a constant), the constant k advantageously lying in the range 0 to 1 (and is preferably equal to 0.4).Accordin
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