On a Spin Back, all Trade (or Touch 1/2).
Then the centers cast 3/4 while the ends U-Turn Back.
\phfour{b2n,g1s,g2n,b1s}
\phdiamond{g1s,b2w,g2n,b1e}
before Spin Back
after
Fan Back omits the first Trade, of course.
\phdiamond{g1n,b2w,g2s,b1e}
\phfour{g1s,b1s,b2n,g2n}
before Fan Back
after
These are normally 4-person calls, so that, when done from a tidal wave,
"centers" means the centers of each side. But beware — when necessary,
they might not really be 4-person calls.
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