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The output of your command "$ ls -l *.html | sort -f" is:

-rwxr-xr-x 1 root root    318 Apr 17  2021 index.html
-rwxr-xr-x 1 root root   1025 Jan 18  2025 contact.html
-rwxr-xr-x 1 root root   1057 Apr 17  2021 tail.html
-rwxr-xr-x 1 root root   9067 Apr 17  2021 head.html
-rwxr-xr-x 1 root root 306262 Apr 17  2021 Solaris.html