xxx
Array
(
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        (
            [id] => 1429
            [topology] => 4<sup>7</sup>T25
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            [transitivity] => [7(12)(11)6]
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            [shear_mod] => 470.6
            [vicker_hard] => 88.7
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
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            [nn] => 1
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            [ref_file] => /References/2017_ChemPhysChem_18_873
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            [ref] => 
        )

)
xxx