[
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            "source-unit" "angstrom" 
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        } 
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        } 
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                ] 
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            ] 
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            ]
        } 
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            ]
        } 
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    } 
    {
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                "bcc"
            ]
        } 
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        } 
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            "source-value" "Im-3m"
        } 
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        "species" {
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            ]
        } 
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    }
]