Shuttle <direction>, Shuttle <anything>

From an 8 chain: all Pass Thru. The centers Slide Thru whil the ends Quarter in the given direction, or take the given call. If no direction is given, they do nothing.

\sxvlines{b3s,g3n,b4s,g4n} \sxvlines{g3w,g4w,b3w,b4e}
3 1 3 1 4 2 4 2 3 1 4 2 3 1 4 2
before Shuttle Left after




\sxvlines{b3s,g3n,b4s,g4n} \syhlines{g1e,b1e,g4w,b2w}
3 1 3 1 4 2 4 2 1 3 1 3 4 2 2 4
before Shuttle Sidetrack after