From general columns: centers Partner Tag, step ahead,
and Trade with each other. Ends Vertical 1/2 Tag into the center, and
Quarter in the specified direction. The directions "in" and "out" are
relative to the center.
\sxvlines{g2n,g3n,b2s,b1s}
\syhlines{b2e,g4w,b3e,g1w}
before Tunnel Out
after
On Tunnel <anything>, the original ends do the <anything> after
their Vertical 1/2 Tag into the center
\sxvlines{g2n,g3n,b2s,b1s}
\sxwtees{g1w,b4w,b3n,g4s}
before Tunnel Reach Out
after
On Tunnel Thru, the Vertical Tag is all the way through, and may be
followed by a direction in the usual way.
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