They are truncated, you only need the first 4 letters of BIP-39 seed words:)
Oh that's right 💡
Hmm... But still, if I extracted all the words which have these specified characters as their first 3-4 characters I get 602 words which gives me 3 nonillion combinations (3*10^30) even if we have a clue word for the last word. I call this #uncypherable with a decent home computer I wander how others get to such lower number of words?