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1. one helix with radius r and pitch P (Fig. 8-8),
2. two co-axial helices of radius r and pitch P, relatively displaced for a
distance of 3P/8 along the helical axis (Fig. 8-9),
3. one helix with radius r and pitch 2P (Fig. 8-10),
4. two co-axial helices of radius r and pitch 2P, relatively displaced for a
distance of P along the helical axis (Fig. 8-11), and
5. two sets of two helices as in Fig. 8-11, relatively displaced for a distance
of 3P/8 along the helical axis (Fig. 8-12).
Figure 8-8. One helix with radius r and pitch P.
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