Trail Chain Thru
This is just a Peel Chain Thru, but the outsides do a Cross Cast Back instead
of a Cast Back.
\syhDBDs{g1w,b4e,g2w,b1e} | \syhlines{b2n,g2s,b3n,g3s} |
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before Trail Chain Thru | after |
The timing is rather awkward, so the original center 2 need to wait before
doing the Fan the Top.