Finish exercice
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&= \overline{ac + ad} \cdot a\bar{c} + b\bar{c}\bar{d} \\
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&= \overline{ac + ad} \cdot a\bar{c} + b\bar{c}\bar{d} \\
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&= \overline{ac} \cdot \overline{ad} \cdot a\bar{c} + b\bar{c}\bar{d} \\
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&= \overline{ac} \cdot \overline{ad} \cdot a\bar{c} + b\bar{c}\bar{d} \\
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&= (\bar{a} + \bar{c}) \cdot (\bar{a} + \bar{d}) \cdot a\bar{c} + b\bar{c}\bar{d} \\
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&= (\bar{a} + \bar{c}) \cdot (\bar{a} + \bar{d}) \cdot a\bar{c} + b\bar{c}\bar{d} \\
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% TODO: finish
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&= (\bar{a} + \bar{a}\bar{d} + \bar{a}\bar{c} + \bar{c}\bar{d}) \cdot a\bar{c} + b\bar{c}\bar{d} \\
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&= a\bar{c}\bar{d} + b\bar{c}\bar{d} \\
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&= (a + b) \cdot \bar{c}\bar{d} \\
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\end{align*}
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\end{align*}
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\end{enumerate}
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\end{enumerate}
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