P -6 2 M,NR.189*CB*  
LATT -1
SYMM   -Y,    X-Y,   Z
SYMM    Y-X, -X,     Z
SYMM    X,    Y,    -Z
SYMM   -Y,    X-Y,  -Z
SYMM    Y-X, -X,    -Z
SYMM    Y,    X,     Z
SYMM   -X,    Y-X,   Z
SYMM    X-Y, -Y,     Z
SYMM    Y,    X,    -Z
SYMM   -X,    Y-X,  -Z
SYMM    X-Y, -Y,    -Z
    0 .6666 / 0 .5 / 0 .5
    SONDER: X .LE. (1+Y)/2
    SONDER: Y .LE. MIN. (1-X,X)
    P -6 2 M,NR.189*CB*