P 3 1 C,NR.159*MJ*
LATT    -1
SYMM    -Y,  X-Y,      Z
SYMM   Y-X,   -X,      Z                
SYMM     Y,    X,  .5+Z
SYMM    -X,  Y-X,  .5+Z
SYMM   X-Y,   -Y,  .5+Z                                             
    0 .6666 / 0 .6666 / 0 .5
    SONDER: X .LE. (1+Y)/2
    SONDER: Y .LE. MIN. (1-X,(1+X)/2)
    P 3 1 C,NR.159*MJ*