Ferris

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 4 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