<anyone> Curve <direction>

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This is a space-invader. It is like Press, but there is a 1/4 turn in the indicated direction. "Ahead" is of course not legal.

\syhlines{b1n,g3s,b4n,g2s} \syhBBBBs{.+.,.+.,b1e,g3s,.+.,.+.,b4e,g2s}
1 3 3 1 4 2 2 4 + + + + 1 3 3 1 + + + + 4 2 2 4
before Boys curve Right after


If the direction is "in" or "out", it is relative to the whole formation.
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