P 4 21 2,NR.90*CS,CZ*
LATT  -1
SYMM  -X,-Y,Z
SYMM  0.5-X,0.5+Y,-Z
SYMM  0.5+X,0.5-Y,-Z
SYMM  Y,X,-Z
SYMM  -Y,-X,-Z
SYMM  0.5+Y,0.5-X,Z
SYMM  0.5-Y,0.5+X,Z
    0 .5 / 0 .5 / 0 .5
    P 4 21 2,NR.90*CS,CZ*