P M N 21,NR.31*Czech*
LATT  -1
SYMM  -X,Y,Z
SYMM  0.5-X,-Y,0.5+Z
SYMM  0.5+X,-Y,0.5+Z
    0 .5 / 0 .5 / 0 1
    P M N 21,NR.31*Czech*