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/usr/share/texmf/multex/plain/base/mulplain.tex is in multex-base 1.0-1.1.

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% First of all input plain.tex
\input plain

\input multexbase

\message{preloading basic multi-lingual fonts,}
\def\mlbasefontnames{%
ltni10,ltnii10,ltniii10,ltniv10,ltnv10,%
crl10,grk10,hbw10,thai10,kana10,%
jp10,cn10,kr10,jsp10,bvi10,bvii10,%
viscl10,viscu10}
\allmlfonts{\tenml}{ten}{\mlbasefontnames}

\message{several japanese fonts, first Mincho,}
% Preload the fonts used by most users
\jfont\sevendm=dm7
%\jfont\eightdm=dm8
%\jfont\ninedm=dm9
%\jfont\tendm=dm10
\let\tendm\tenjp
\jfont\twelvedm=dm12
\jfont\seventeendm=dm17
\message{then Gothic,}
\jfont\sevendg=dg7
\jfont\tendg=dg10
\jfont\twelvedg=dg12
\jfont\seventeendg=dg17

% For upward compatibility
\let\jsml=\sevendm \let\jstd=\tendm \let\jbig=\twelvedm \let\jlrg=\seventeendm

\message{ascii fonts,}
\font\smallrm=cmr7 \font\smallit=cmti7
%\font\smallsl=cmsl7 % This font does not exists on standard distribution
\font\smallsl=cmsl8
\font\smallbf=cmbx7 \font\smalltt=cmtt8

\font\bigrm=cmr12 scaled\magstep1 \font\bigit=cmti12 scaled\magstep1
\font\bigsl=cmsl12 scaled\magstep1 \font\bigbf=cmbx12 scaled\magstep1
\font\bigtt=cmtt12 scaled\magstep1

\font\largerm=cmr10 scaled\magstep4 \font\largeit=cmtt10 scaled\magstep4
\font\largesl=cmsl10 scaled\magstep4 \font\largebf=cmbx10 scaled\magstep4
\font\largett=cmtt10 scaled\magstep4

\font\etlrm=cmr9 \font\etlit=cmti9
\font\etlsl=cmsl9 \font\etlbf=cmbx9
\font\etltt=cmtt9

\message{Standard style selectors,}
\def\smalljapanesefont{\baselineskip=12pt%
\def\:{\hskip0.89815pt plus0.43056pt minus0.28704pt}%
\def\<{\hskip1.34723pt plus0.64584pt minus0.43056pt}%
\def\rm{\fam0 \smallrm}%
\def\it{\fam\itfam\smallit}%
\def\sl{\fam\slfam\smallsl}%
\def\bf{\fam\bffam\smallbf}%
\def\tt{\fam\ttfam\smalltt}%
\rm\jsml}

\def\standardjapanesefont{\baselineskip=18pt%
\def\:{\hskip1.11111pt plus0.55556pt minus0.37778pt}%
\def\<{\hskip1.66667pt plus0.83333pt minus0.55556pt}%
\def\rm{\fam0 \tenrm}%
\def\it{\fam\itfam\tenit}%
\def\sl{\fam\slfam\tensl}%
\def\bf{\fam\bffam\tenbf}%
\def\tt{\fam\ttfam\tentt}%
\rm\jstd\tenml}

\def\bigjapanesefont{\baselineskip=24pt%
\def\:{\hskip1.30444pt plus0.65277pt minus0.43518pt}%
\def\<{\hskip1.95832pt plus0.97916pt minus0.65277pt}%
\def\rm{\fam0 \bigrm}%
\def\it{\fam\itfam\bigit}%
\def\sl{\fam\slfam\bigsl}%
\def\bf{\fam\bffam\bigbf}%
\def\tt{\fam\ttfam\bigtt}%
\rm\jbig}

\def\largejapanesefont{\baselineskip=36pt%
\def\:{\hskip2.30444pt plus1.15222pt minus0.76815pt}%
\def\<{\hskip3.45667pt plus1.72834pt minus1.15222pt}%
\def\rm{\fam0 \largerm}%
\def\it{\fam\itfam\largeit}%
\def\sl{\fam\slfam\largesl}%
\def\bf{\fam\bffam\largebf}%
\def\tt{\fam\ttfam\largett}%
\rm\jlrg}

\tenml % select basic multi-lingual font as default

\input sitemlcode

\def\JTeX{\leavevmode\lower.5ex\hbox{J}\kern-.18em\TeX}
\def\MuLTeX{M\kern-.1667em u\kern-.1667em\lower.5ex\hbox{L}\kern-.25em\TeX}

\def\fmtname{mplain}\def\fmtversion{\mlbaseversion} % identifies this format