there is an algorithm for how often a letter appears in common writing, so if you dont have an algorithm you could use pattern matching, which works best if you have a program (although I dont know where you could get one)
however, if you find a three letter word, most common three letter words are and & the, so replace the letters that are shared in other words, and see if anything makes sense, if not, try again.
It could take some time, but its the easiest kind of encryption to break.
If they are skipping letters or using some other sort of pattern with random junk in between, you are s-o-l unless you have some sort of key - algorithm.
good luck
numist
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