I 21 21 21,Nr.24*Czech*
LATT  -2
SYMM  0.5-X,-Y,0.5+Z
SYMM  0.5+X,0.5-Y,-Z
SYMM  -X,0.5+Y,0.5-Z
    0 .5 / 0 .5 / 0 .5
    I 21 21 21,Nr.24*Czech*