$PDET group              (required if NPDET>0 in $GMCPT)
 
    This group defined the "parent" determinants, which
will be excited to excitation level NEXCIT.  There must be
a total of NPDET determinants given in the group.  Each
determinant may have spaces at the front or rear, but not
embedded within the string.  An example, presuming NPDET=3,
is
 
 $PDET
    2200
    2+-0
    2-+0
 $END