Prior to carrying out an adjustment, we can order [B/D] to
retain
the canonical directions by issuing a KEEP:
command with a cd argument. Usually we don't bother to keep the
canonical directions, and retaining them unnecessarily slows the program
a little, so to keep them now we will have to fix it so that the program
knows that it is to retain the directions, and then re-enter the
ADJUST: command:
BD>keep:cd=Y 
BD>adjust:[B / D]
We have chosen the stem ``Y'' for our name, so that the names of our canonical directions will be Y1 and Y2. (We could have chosen another stem, such as ``Mad'', corresponding to naming the canonical directions as ``Mad1'' and ``Mad2''.) When the adjustment has been carried out, the directions will be retained and available to us in the form of assignments.