Figure 1 Hopf, multiple crossing and the three simplest three-component links. The corresponding edges of the ring nets that connect the ring-net nodes are shown by arrows. For the Borromean link, the ring-net fragment contains an additional node in the centre of the link. The program Knotplot (R. G. Scharein; http://www.knotplot.com/) was used to draw the link pictures.
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