xxx
Array
(
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        (
            [id] => 1212
            [topology] => 4<sup>9</sup>T3
            [link_rcsr] => 
            [in_col] => 9
            [transitivity] => [9(16)(12)3]
            [space_group] => Cmcm
            [pearson] => oS92
            [cn] => 4
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            [pressure] => 
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            [e_gap] => 
            [energy] => 0.767
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            [shear_mod] => 401.2
            [vicker_hard] => 75.1
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 1213
            [topology] => 4<sup>9</sup>T3
            [link_rcsr] => 
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            [space_group] => Cmcm
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            [cn_sort] => 004-
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            [nn] => 1
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            [energy] => 
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            [ref_file] => /References/2013_JChemPhys138_164703_KelvinC
            [publ_year] => 2013
            [ref] => 
        )

)
xxx