| http://www.w3.org/ns/prov#value | - Preferably G is an even number and G>>N as disclosed in detail hereinabove for the magnetic structure 942 of FIG. 20B. Alternatively, the magnetic structure 948 may be made of a plurality of blocks (not shown) made from a permanent magnetic material embedded in a disc of non-magnetic, non-ferromagnetic material such as a suitable plastic material, an epoxy resin or the like.
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