If $\overline{\mathrm{a}} + \overline{\mathrm{b}} +\overline{\mathrm{c}} = \overline{0},$ then $\overline{\mathrm{a}}.\overline{\mathrm{a}} + \overline{\mathrm{b}}.\overline{\mathrm{b}} + 2(\overline{\mathrm{a}}.\overline{\mathrm{b}}) -\overline{\mathrm{c}}.\overline{\mathrm{c}} =$

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