Explosion

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From columns: #2 and #4 Press Out, and, from these fudgy 2-faced lines, do a "Slippery Couples Circulate". "Slippery" means the very center 2 Trade as they go past.

\sxvlines{b3s,g3s,b4s,g4s}	\syhBBBBs{b2n,...,g2n,...,...,g3s,...,b3s}	\syhlines{b1n,g3n,g2s,b2s}
before Explosion	after Press Out	finished