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+\newenvironment{while}{\medskip}{\medskip}
+
+\def\whskip{\texttt{skip}}
+\def\whass#1#2{\texttt{#1 := #2}}
+\def\whcomp#1#2{#1\texttt{;} #2}
+\def\whif#1#2#3{\texttt{if #1 then #2 else #3 endif}}
+\def\whwhile#1#2{\texttt{while #1 do #2 done}}