xxx
Array
(
    [0] => Array
        (
            [id] => 1947
            [topology] => 4<sup>4</sup>T28-CA
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            [in_col] => 4
            [transitivity] => [4973]
            [space_group] => Ima2
            [pearson] => oI32
            [cn] => 4
            [Year] => 2023
            [cn_sort] => 004-
            [topology_str] => 4^4T28-CA
            [caid] => 662
            [nn] => 0
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            [e_gap] => 
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            [vicker_hard] => 58.5
            [ref_file] => 
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            [ref] => 
        )

    [1] => Array
        (
            [id] => 1948
            [topology] => 4<sup>4</sup>T28-CA
            [link_rcsr] => 
            [in_col] => 4
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            [space_group] => Ima2
            [pearson] => oI32
            [cn] => 4
            [Year] => 2023
            [cn_sort] => 004-
            [topology_str] => 4^4T28-CA
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            [ref_file] => /References/2023_ActaCrystB_79
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            [ref] => doi:&nbsp;<a href="http://doi.org/10.1107/S205252062300255X" target="_blank">10.1107/S205252062300255X</a>
        )

)
xxx