R 3,NR.146*CB*
LATT     -3
SYMM     -Y,   X-Y,    Z
SYMM    Y-X,    -X,    Z  
    0 .6666 / 0 .6666 / 0 .3333
    SONDER: X .LE. (1+Y)/2
    SONDER: Y .LE. MIN. (1-X,(1+X)/2)
    R 3,NR.146*CB*