xxx
Array
(
    [0] => Array
        (
            [id] => 351
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            [link_rcsr] => http://rcsr.net/nets/cbo
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            [transitivity] => [1232]
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            [name] => 
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            [e_gap] => 
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            [shear_mod] => 296.6
            [vicker_hard] => 50.3
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 352
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            [density] => 3.09
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            [shear_mod] => 
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            [ref_file] => /References/2012_PhysRev_B_85_214104
            [publ_year] => 2012
            [ref] => 
        )

    [2] => Array
        (
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            [topology] => cbo
            [link_rcsr] => http://rcsr.net/nets/cbo
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            [energy] => 
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            [shear_mod] => 
            [vicker_hard] => 
            [ref_file] => /References/2015_PhysRevB91_214106
            [publ_year] => 2015
            [ref] => 
        )

)
xxx