Ferris
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This is the generalization of the behavior of Ferris Wheel. From 2-faced lines, all 1/2 Press Ahead, then do the call in triple lines, and compress phantoms where possible.
\syhlines{b3n,g3n,g4s,b4s}
\sxvlines{g3e,g2e,b4w,b1w}
3
1
3
1
4
2
4
2
3
1
2
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4
2
1
3
before Ferris 1/2 Tag
after
The compression of phantoms may be unusual:
\syhlines{b3n,g3n,g4s,b4s}
\syvlines{b3e,g3e,b2e,g2e}
3
1
3
1
4
2
4
2
3
1
3
1
2
4
2
4
before Ferris Lockit
after
Or it may be impossible:
\syhlines{b3n,g3n,g4s,b4s}
\syvBBBs{.+.,b3e,.+.,g3e,g4w,b2e}
3
1
3
1
4
2
4
2
+
+
3
1
+
+
3
1
4
2
2
4
before Ferris Bend the Line
after
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