When writing unsymmetrical material, one sometimes moves the entire square
into a position that is not centered on its original location. In such a
situation, it is sometimes useful to tell the dancers to forget that original
location and consider their present location to be the entire setup. Sd
has a pseudo-call `recenter' that can be used for this purpose. It
recenters the setup, that is, throws away unsymmetrical phantoms. Its level
has been set to C1. It is not a real call, of course. There is no standard
convention for what you have to say to the dancers when you want to perform
this operation.
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