xxx
Array
(
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        (
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            [topology] => 3<sup>10</sup>T1
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            [transitivity] => [(10)(15)(11)5]
            [space_group] => Im-3m
            [pearson] => cI720
            [cn] => 3
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            [name] => 
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            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

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        (
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            [ref] => 
        )

)
xxx