The numbers.txt file is generated to hold a list of up to 100 four-digit number combinations (from 0000 to 0099).
Its purpose within this lab is to be combined with your other password lists. This addition makes your dictionary attack more robust by including simple numeric passwords, which are often used and easy to guess.
Essentially, it expands your pool of potential passwords for Hydra to test during the brute-force attack.
Does that make sense? Let me know if you have any other questions!
