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<math>\begin{array}{l}

<math>\begin{array}{l}

((x \overset{A}{\Uparrow} ~y \overset{B}{\underset{A}{\Uparrow}}) \overset{B}{\Uparrow} ~z \overset{C}{\underset{B}{\Uparrow}}) \overset{C}{\Uparrow}

((x \underset{A}{\Downarrow} ~y \overset{A}{\underset{B}{\Downarrow}}) \underset{B}{\Downarrow} ~z \overset{B}{\underset{C}{\Downarrow}}) \underset{C}{\Downarrow}

~ (y \overset{A}{\underset{B}{\Downarrow}}

~ (z \overset{B}{\underset{C}{\Downarrow}}

~  P \overset{B \Rightarrow C}{\underset{(A \Rightarrow B) \Rightarrow (A \Rightarrow C)}{\Downarrow}})\overset{A \Rightarrow B}{\underset{B \Rightarrow C}{\Downarrow}} )\overset{A}{\underset{C}{\Downarrow}})\underset{C}{\Downarrow}

\end{array}</math>

\end{array}</math>

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