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X-PEL 1500 Lockpicking (Easy)

This lock requires four 4-digit numbers. Write a four digit code to #LOCK to input a code. Input 4 codes and write any value to the #ENTR register to test the codes. File 300 contains a keyword. The keyword is also found in one of the files in the DATA host. The codes for the lock are the four values immediately following the keyword. File 301 contains the IDs of the other four files in the DATA host.

Append the 4 codes to file 300 and leave it in your host. Create a different file with all of the data in file 302 and leave it in your host. I am going on a short vacation to celebrate completing this puzzle. Please feed the dog on your way out by writing any value to #FEED once you are done.

This is slightly more complex than my last puzzle but can still be solved relatively fast. I would like to think that my code is getting slightly more optimized: this is almost twice as large as my last puzzle, but still runs at the same speed (slow). I hope that future puzzles will build from these mechanics. I have a basic idea for the next puzzle but it needs to be developed a bit more.