P -6 C 2,NR.188*CB*  
LATT -1
SYMM   -Y,    X-Y,  Z
SYMM    Y-X, -X,    Z
SYMM    X,    Y,    .5-Z
SYMM   -Y,    X-Y,  .5-Z
SYMM    Y-X, -X,    .5-Z
SYMM   -Y,   -X,    .5+Z
SYMM    X,    X-Y,  .5+Z
SYMM    Y-X,  Y,    .5+Z
SYMM   -Y,   -X,   -Z
SYMM    X,    X-Y, -Z
SYMM    Y-X,  Y,   -Z
    0 .6666 / 0 .6666 / 0 .25
    SONDER: X .LE. (1+Y)/2
    SONDER: Y .LE. MIN. (1-X,(1+X)/2)
    P -6 C 2,NR.188*CB*