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"structure_string": "Er2 Cu1 Ru1\n1.0\n-0.000000 3.384387 3.384387\n3.384387 0.000000 3.384387\n3.384387 3.384387 -0.000000\nEr Cu Ru\n2 1 1\ndirect\n0.000000 0.000000 0.000000 Er\n0.499999 0.499999 0.499999 Er\n0.250000 0.250000 0.250000 Cu\n0.750001 0.750001 0.750001 Ru\n",
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