Grand Switch
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From a tidal line, all Trade and the center 6 slide past each other in pairs. This is Grand Working as Ends Switch, if that helps.
\sxhlines{b2s,g1n,g2s,b1n}
\sxhlines{g1s,b1s,b2n,g4s}
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4
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4
1
3
1
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1
3
2
4
4
2
before Grand Switch
after
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