
\reversemarginpar
\marginparwidth = 2in

\def\STARTCHAPTER{%
   \marginpar{%
      \parindent=0pt
      \rule{.1in}{.1in} \hskip .1in
      \sffamily\the@NFChapQuote\par
      \vskip 6pt\the@NFQuoting
   }%
   \vskip -\baselineskip
   \noindent\the@NFChapterOpening
}


\def\STARTBOX{\vskip .2in\setbox0=\vbox\bgroup\noindent}
\def\ENDBOX{\egroup\fbox{\box0}\vskip .2in}


\def\STARTSOLN{\noindent{\sffamily SOLUTION}\ }
\def\ENDSOLN{\vskip -\baselineskip\hfill\rule{.1in}{.1in}\vskip\baselineskip}



\def\STARTPROOF{\noindent{\sffamily PROOF}\ }
\def\ENDPROOF{\hfill\rule{.1in}{.1in}}


\def\STARTNOTE{\vskip 12pt\noindent{\itshape Note: }}
\def\ENDNOTE{\vskip 12pt}

\def\STARTINSTR{{\noindent\sffamily\bfseries\the@NFProbNumbers}%
    \hskip 3mm\rule{.1in}{.1in}}
\def\ENDINSTR{\vskip 12pt}