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\newcommand {\exo@SquareBox}[2][0.033em]{}
%{\color{blue}\huge$\diamondsuit$}}
\def \ExerciseName {Exercise}
\def \AnswerName {Answer}

\newtheorem{Exercise}{\aname{Exo-\theExercise}{\ExerciseName}}
\newcounter{Question}

\newenvironment {exercise}[1][]
    {\def \@test {#1}\ifx \@test \empty \begin{Exercise}\else
     \begin{Exercise}[#1]\fi
     \setcounter{Question}{0}}
    {\exo@SquareBox {0.5em}\end{Exercise}}

\newenvironment {answer}{\em 
\stepcounter{Question}
%\begin{tabular*}{\linewidth}{r}
\begin{flushright}
\bf \ahrefloc{Rep-\theExercise.\theQuestion}{\AnswerName}
\end{flushright}
%\end {tabular*}
\begin{cutflow}{Answer}
\aname {Rep-\theExercise.\theQuestion}{}}
{\end{cutflow}
}

\newcommand{\inputanswers}[1][\jobname]{\bgroup \input {#1.ans}\egroup}

\def \AnswerContinued #1#2#3{\subsubsection* {(Exercise #1, continued)}}
\def \AnswerNew #1#2#3{\subsection* {\ahrefloc {Exo-#1}{Exercise #1}, page #3}}
\newcommand {\ExerciseNew}[4]{}

\let \exo@chap \@empty
\newcommand {\ExerciseItem}[4]
  {\def \@test {#2}\ifx \@test \exo@chap \let \do \relax \else
   \def \do {\gdef \exo@chap {#2}
   \\\multicolumn {2}{l}{\bf Chapter \exo@chap}\\[0.5em]}\fi
   \do
   \hspace {2em}\ahrefloc{Exo-#1}{#1}:\quad & #4\\}
\def \listofexercises 
{\bgroup 
 \let \ExerciseNew \ExerciseItem
 \begin{tabular}{rp{}}\input {ocaml.exo}\end{tabular}
 \egroup}