A+B+C‾\overline{\mathrm{A}+\mathrm{B}+\mathrm{C}}A+B+C
A‾+B‾+C‾\overline{\mathrm{A}}+\overline{\mathrm{B}}+\overline{\mathrm{C}}A+B+C
ABCABCABC
Aˉ+Bˉ+Bˉ‾\overline{\bar{A}+\bar{B}+\bar{B}}Aˉ+Bˉ+Bˉ