\documentclass{article}

\begin{document}
beforeinput\input{foo}afterinput

beforeinput.tex\input{foo.tex}afterinput.tex

before inclusion of just-comment\input just-comment.tex after inclusion of just-comment

before inclusion of no-eol\input no-eol after inclusion of no-eol.

before inclusion of no-eol\input{no-eol}after inclusion of no-eol (braces).

beforeinclude\include{foo}afterinclude

\end{document}

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