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%#!uptex -ini
%\let\dump\relax
%\input plain
\newcount\fuga\newcount\dflt
\fuga="3300
\iffalse
\global\let\prebreakpenalty=\inhibitxspcode
\dflt=3
\else
\dflt=0
\fi
\scrollmode
\newcount\hoge\hoge="3000
\loop\ifnum\hoge<\fuga
\message{\the\hoge}\prebreakpenalty\hoge=2
\advance\hoge 3\relax \repeat
\message{<\the\prebreakpenalty"3003, \the\prebreakpenalty"4000>}% 2, D
{
\prebreakpenalty"3003=\dflt\relax
\global\prebreakpenalty"4000=1\relax% error
\message{<\the\prebreakpenalty"3003, \the\prebreakpenalty"4000>}% D, D
}
\message{<\the\prebreakpenalty"3003, \the\prebreakpenalty"4000>}% 2, D
{
\global\prebreakpenalty"3003=\dflt\relax
\prebreakpenalty"4000=1\relax% no error
\message{<\the\prebreakpenalty"3003, \the\prebreakpenalty"4000>}% D, 1
}
\message{<\the\prebreakpenalty"3003, \the\prebreakpenalty"4000>}% D, D
\prebreakpenalty"4000=1\relax% no error
\message{<\the\prebreakpenalty"3003, \the\prebreakpenalty"4000,
\the\prebreakpenalty"3549>}% D, 1, D
\prebreakpenalty"4000=\dflt\relax
\prebreakpenalty"3549=1\relax% no error
\message{<\the\prebreakpenalty"3003, \the\prebreakpenalty"4000,
\the\prebreakpenalty"3549>}% D, D, 1
\end
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