
@lThe expert selection mode allows you to view

@lany 1-, 2-, or 3- face of the tesseract.

@lThe "Christmas tree" interface is used as

@lfollows:  the "trunk" is the tesseract

@litself.  There are four pairs of 3-faces of

@lthe tesseract, they form the lowest

@lbranches.  When you choose one of them, the

@l"+" and "-" buttons allow you to choose one

@lor the other of the pair.  Each of these

@lcubes can then be decomposed in an analogous

@lmanner.
