R -3,NR.148*CB*
LATT      3
SYMM     -Y, X-Y,  Z
SYMM    Y-X,  -X,  Z
    0 .6666 / 0 .6666 / 0 .1666
    SONDER: X .LE. (1+Y)/2
    SONDER: Y .LE. MIN. (1-X,(1+X)/2)
    R -3,NR.148*CB*