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"structure_string": "Ca4 Er2\n1.0\n5.755265 3.322804 9.398308\n-5.755265 3.322804 9.398308\n0.000000 -6.645607 9.398308\nCa Er\n4 2\ndirect\n0.625000 0.625000 0.124999 Ca\n0.625000 0.124999 0.625000 Ca\n0.124999 0.625000 0.625000 Ca\n0.625000 0.625000 0.625000 Ca\n0.500000 0.500000 0.500000 Er\n0.750000 0.750000 0.750000 Er\n",
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