xxx
Array
(
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        (
            [id] => 1411
            [topology] => 4<sup>8</sup>T25
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            [transitivity] => [8(18)(15)6]
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            [name] => 
            [pressure] => 
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            [e_gap] => 
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            [shear_mod] => 425.0
            [vicker_hard] => 78.9
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
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            [cn_sort] => 004-
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            [energy] => 
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            [shear_mod] => 
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            [ref_file] => /References/2017_ChemPhysChem_18_873
            [publ_year] => 2017
            [ref] => 
        )

)
xxx