§ Задание 81
\[\boxed{\mathbf{1}\mathbf{.81}}\]

\[AP;AS;AB;PS;PB;SB;\]
\[BA;BP;BS;SA;SP;PA.\]
\[\textbf{а)}\ AP < AB\]
\[\textbf{б)}\ SB < PB\]
\[\textbf{в)}\ PS < AB\ \]
\[\boxed{\mathbf{1}\mathbf{.81}}\]

\[AP;AS;AB;PS;PB;SB;\]
\[BA;BP;BS;SA;SP;PA.\]
\[\textbf{а)}\ AP < AB\]
\[\textbf{б)}\ SB < PB\]
\[\textbf{в)}\ PS < AB\ \]