P 62,NR.171*CB*
LATT    -1
SYMM    -Y,    X-Y,  .66667+Z
SYMM   Y-X,     -X,  .33333+Z
SYMM    -X,     -Y,      Z
SYMM     Y,    Y-X,  .66667+Z
SYMM   X-Y,      X,  .33333+Z
    0 1 / 0 1 / 0 .3333
    SONDER: Y .LE. X
    P 62,NR.171*CB*