Cross Drop <direction>
On a Cross Drop, the centers come out to opposite hands, as if doing a Cross Extend.
The points, as usual, have to get out of the way appropriately.
\pvdiamond{g1w,b2s,g2e,b1n} | \phBB{g1n,b2s,b1n,g2s} |
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before Cross Drop Out | after |