This is e-upTeX, Version 3.141592653-p4.1.0-u1.29-230214-2.6 (utf8.sjis) (TeX Live 2023) (preloaded format=platex 2023.7.24)  11 JAN 2024 19:24
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**chapter3.tex
(./chapter3.tex
pLaTeX2e <2023-02-14>+1, based on
LaTeX2e <2023-06-01> patch level 1
L3 programming layer <2023-06-30>
! Undefined control sequence.
l.1 \chapter
            {提案手法}
? 
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