[
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            "si-unit" "kg / m s^2" 
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        } 
        "c12" {
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            "si-unit" "kg / m s^2" 
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        } 
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        }
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    {
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        } 
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        "isothermal-bulk-modulus" {
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            "si-unit" "kg / m s^2" 
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        }
    }
]