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diff --git a/language/japanese/pxbase/upkcat.sty b/language/japanese/pxbase/upkcat.sty
deleted file mode 100644
index 721bddd2e2..0000000000
--- a/language/japanese/pxbase/upkcat.sty
+++ /dev/null
@@ -1,79 +0,0 @@
-%%
-%% This is file 'upkcat.sty'.
-%%
-%% Copyright (c) 2008-2021 Takayuki YATO (aka. "ZR")
-%% GitHub: https://github.com/zr-tex8r
-%% Twitter: @zr_tex8r
-%%
-%% This package is distributed under the MIT License.
-%%
-
-% Note: This package supports both upLaTeX and plain upTeX.
-
-%% avoid multiple loading
-\csname\if11upkcatstyLoaded\fi\endcsname
-%% code guards
-\edef\x{\catcode32=\the\catcode32%
-\catcode43=\the\catcode43\catcode45=\the\catcode45%
-\catcode46=\the\catcode46\catcode47=\the\catcode47%
-\catcode60=\the\catcode60\catcode63=\the\catcode63%
-\catcode64=\the\catcode64\catcode96=\the\catcode96%
-\endlinechar=\the\endlinechar\relax}
-\catcode32=10\relax\endlinechar=13\relax
-\catcode43=12 \catcode45=12 % <+><->
-\catcode46=12 \catcode47=12 % <.></>
-\catcode60=12 \catcode63=12 % <<><?>
-\catcode64=11 \catcode96=12 % <@><`>
-\edef\pxkq@restore@codes{\x\let\noexpand\pxkq@restore@codes\relax}
-%% check for LaTeX
-\ifx\RequirePackage\@undefined %<*!LaTeX>
- \long\def\x#1\ProvidesPackage#2[#3]{\immediate\write-1{Package: #2 #3}}
- \expandafter\x
-\else %<*LaTeX>
- \RequirePackage{ifuptex}[2008/03/14]\RequireupTeX
-\fi %</LaTeX>
-
-%% package declaration
-\NeedsTeXFormat{pLaTeX2e}
-\ProvidesPackage{upkcat}[2021/05/31 v1.3 safe kcatcode access]
-
-%--------------------------------------- main
-
-%%<*> \getkcatcode{<jachar>}
-\def\getkcatcode#1{\pxkq@getcp{#1}%
- \edef\thekcatcode{\the\kcatcode\pxkq@cp}}
-%%<*> \setkcatcode{<jachar>}{<value>}
-\def\setkcatcode#1#2{\pxkq@getcp{#1}\kcatcode\pxkq@cp#2}
-\newcount\pxkq@cp \newif\ifpxkq@ok
-\def\pxkq@getcp#1{\pxkq@getcp@a#1\relax\relax}
-\def\pxkq@nxt#1#2#3#4#5{\pxkq@cp#1\loop
- {\lccode`\?\pxkq@cp \advance\pxkq@cp-#3%
- \lowercase{\expandafter\xdef\csname pxkq@#4?\endcsname}{#5}}%
- \advance\pxkq@cp\@ne \ifnum\pxkq@cp<#2\repeat}
-\pxkq@nxt{240}{248}{240}l{\pxkq@cp\the\pxkq@cp\noexpand\pxkq@da}
-\pxkq@nxt{224}{240}{224}l{\pxkq@cp\the\pxkq@cp\noexpand\pxkq@ca}
-\pxkq@nxt{194}{224}{192}l{\pxkq@cp\the\pxkq@cp\noexpand\pxkq@ba}
-\pxkq@nxt{128}{192}{128}t{\advance\pxkq@cp\the\pxkq@cp\noexpand\pxkq@oktrue}
-\def\pxkq@getcp@a#1{\pxkq@cp`#1\relax\pxkq@chkk#1%
- \ifpxkq@ok \let\pxkq@nxt\pxkq@end \else
- \expandafter\let\expandafter\pxkq@nxt\csname pxkq@l\string#1\endcsname
- \ifx\pxkq@nxt\relax \let\pxkq@nxt\pxkq@err \fi
- \fi \pxkq@nxt}
-\def\pxkq@stp#1#2{\multiply\pxkq@cp64\pxkq@okfalse
- \csname pxkq@t\string#2\endcsname
- \ifpxkq@ok \expandafter#1\else \expandafter\pxkq@err \fi}
-\def\pxkq@end#1\relax{}
-\def\pxkq@ba{\pxkq@stp\pxkq@end}\def\pxkq@ca{\pxkq@stp\pxkq@cb}
-\def\pxkq@cb{\pxkq@stp\pxkq@end}\def\pxkq@da{\pxkq@stp\pxkq@db}
-\def\pxkq@db{\pxkq@stp\pxkq@dc}\def\pxkq@dc{\pxkq@stp\pxkq@end}
-\begingroup\lccode`8=`k\lccode`9=`a \lowercase{\endgroup
- \def\pxkq@chkk#1{\pxkq@okfalse\expandafter\pxkq@chkk@a\meaning#189\@nil}
- \def\pxkq@chkk@a#189#2\@nil{\ifcat @#1@\pxkq@oktrue\fi}}
-\def\pxkq@err#1\relax{\errhelp{I regard it as U+FFFF}%
- \errmessage{Corrupted UTF-8 bytes}\pxkq@cp65535\relax}
-%\def\pxkq@end#1\relax{\showthe\pxkq@cp}
-
-%--------------------------------------- all done
-\pxkq@restore@codes
-\endinput
-%% EOF