Array
(
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        (
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            [caid] => 289
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            [pressure] => 
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            [e_gap] => 
            [energy] => 0.631
            [bulk_mod] => 
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        (
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            [space_group] => P63/mmc
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            [caid] => 289
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            [energy] => 
            [bulk_mod] => 45.9
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            [ref_file] => /References/2008_PhysRevB_77_113402
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            [ref] => 
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    [2] => Array
        (
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            [space_group] => P63/mmc
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            [ref_file] => /References/2009_ChemPhysLett_473_108
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            [space_group] => P63/mmc
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            [ref_file] => /References/2010_JSuperhardMat_32_67
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)