Bud Brewer gave us these Os & Us:
I don?t know anything about types, an I definitely don?t know anything about the math of these things. Long ago I sat down an figured out the way the passes go under an wrote it down. Lost it an so, redid it again. I think it is correct. Maybe this will help with the knots
PINEAPPLES
2 pass ? first pass under 2 at the top, under 2 at the bottom. There after, under 3 both top and bottom. (basic pineapple)
3 pass ? first pass under 2 at top, under 4 at bottom. There after under 3 at top and under 5 at bottom
4 pass ? first pass under 2 at top, under 6 at bottom. There after under 3 at top and under 7 at bottom
5 pass ? first pass under 2 at top, under 8 at bottom. There after under 3 at top and under 9 at bottom
6 pass ? first pass under 2 at top, under 10 at bottom. There after under 3 at top and under 11 at bottom
http://khww.net/photogallery.php?photo_id=699
Hope it helps.