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https://github.com/monero-project/monero/blob/master/src/mnemonics/english.h This is a list of all the seed words used in Monero. You can check yourself if it is ok for your seed. I don't know if it is ok in general to only remember 3 letters but briefly glancing at the list I did not see any words using the same 3 first letters.
I tested it on this wordlist https://github.com/Mitchellpkt/mnemonic-encoder-decoder/blob/main/wordlist.txt which I think matches the English monero wordlist https://github.com/monero-project/monero/blob/f0bc684ccdc7bc66010254c9136f960467e6a3db/src/mnemonics/english.h