$[\overline{\mathrm{b}} \overline{\mathrm{c}} \overline{\mathrm{d}}]\overline{\mathrm{a}}-[\overline{\mathrm{a}} \overline{\mathrm{c}} \overline{\mathrm{d}}]\overline{\mathrm{b}}+[\overline{\mathrm{a}} \overline{\mathrm{b}} \overline{\mathrm{d}}]\overline{\mathrm{c}}-[\overline{\mathrm{a}} \overline{\mathrm{b}} \overline{\mathrm{c}}]\overline{\mathrm{d}}=$

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