If $\overrightarrow{\mathrm{a}}=2\overline{\mathrm{i}}+3\overline{\mathrm{j}}-4\overline{\mathrm{k}}, \overrightarrow{\mathrm{b}}=\overline{\mathrm{i}}+\overline{\mathrm{j}}+\overline{\mathrm{k}}, \overrightarrow{\mathrm{c}}=4\overline{\mathrm{i}}+2\overline{\mathrm{j}}+3\overline{\mathrm{k}}$ then $|\overrightarrow{\mathrm{a}}\times (\overrightarrow{\mathrm{b}} \times \overrightarrow{\mathrm{c}} \left)\right|=$

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