Grand Working <direction>
This is used in a setup in which the call could have been directed to
each side, or could have been directed to the centers. For example, Ah So
from a tidal wave, or Reach Out from columns. It directs people to
make their own decision about which subsetup to work in, based on the
given direction. The starting setups overlap, and the resulting setups
typically overlap the same way.
This concept is described in more detail in Book 3.
Supplemental Material: