where are the robots

https://play.picoctf.org/practice/challenge/4?page=4

• https://jupiter.challenges.picoctf.org/problem/60915/

• the title hints at [[robots.txt]], so looking at /robots.txt

User-agent: *
Disallow: /8028f.html

• going to /8028f.html

• picoCTF{ca1cu1at1ng_Mach1n3s_8028f}