Query regarding the output of --recorder?

[Pablo González L]

Hi, everybody, I have a little query regarding the output generated by
'--recorder'. I know that in the .fls file the lines of the files read and
written during the compilation of a document (one or more times) are added, my
question is, why some lines are duplicated consecutively?
For example:
$ pdflatex --interaction=batchmode --recorder sample2e
generates:
PWD /home/pablo
INPUT /usr/local/texlive/2019/texmf.cnf
INPUT /usr/local/texlive/2019/texmf-dist/web2c/texmf.cnf
INPUT /usr/local/texlive/2019/texmf-var/web2c/pdftex/pdflatex.fmt
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/sample2e.tex
OUTPUT sample2e.log
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/article.cls
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/article.cls
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/size10.clo
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/size10.clo
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/l3backend/l3backend-pdfmode.def
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/l3backend/l3backend-pdfmode.def
INPUT sample2e.aux
INPUT sample2e.aux
OUTPUT sample2e.aux
INPUT /usr/local/texlive/2019/texmf-dist/fonts/map/fontname/texfonts.map
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmr17.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmr12.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmr8.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmr6.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmmi12.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmmi8.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmmi6.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmsy10.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmsy8.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmsy6.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmr12.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmbx12.tfm
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/jknappen/ec/tcrm1000.tfm
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/omscmr.fd
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/omscmr.fd
INPUT /usr/local/texlive/2019/texmf-dist/fonts/tfm/public/cm/cmti10.tfm
OUTPUT sample2e.pdf
INPUT /usr/local/texlive/2019/texmf-var/fonts/map/pdftex/updmap/pdftex.map
INPUT sample2e.aux
INPUT /usr/local/texlive/2019/texmf-dist/fonts/enc/dvips/cm-super/cm-super-ts1.enc
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmbx12.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmex10.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi10.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmmi7.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmr10.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmr12.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmr17.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmr6.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmr7.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmr8.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmsy10.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmsy7.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/amsfonts/cm/cmti10.pfb
INPUT /usr/local/texlive/2019/texmf-dist/fonts/type1/public/cm-super/sfrm1000.pfb

And these lines are duplicated
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/article.cls
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/article.cls
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/size10.clo
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/base/size10.clo
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/l3backend/l3backend-pdfmode.def
INPUT /usr/local/texlive/2019/texmf-dist/tex/latex/l3backend/l3backend-pdfmode.def

and they've only been loaded once.
Saludos