Thanks, Jack, that's what I thought, but I still can't work it out. I've been over and over my list of additional letters and I'm sure it's correct, even counting in the possible variants in 12a and 23a. I can extract a six-letter adjective that clearly applies to the 'related features', but that uses up all the vowels and leaves me with a bunch of consonants that I can't rearrange into anything. So I'm assuming that one of the words isn't the obvious one. Is that right?