From those 602 words, there are some words with too many ms or ts. These can also be filtered, resulting in 574 possible words:
cut -c 1-4 <english.txt | grep -E "^[$SCRAMBLED]+$" | grep -Ev 'm.*m|t.*t' | wc 574 574 2833
FractalEncrypt said he got the list of words down to 547 and I'm not at all sure why he got that number of words.
I didn't see a mention of 547 in the linked post. Could it have been 574?
Totally could have been 574.
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