>I too guessed alphabetical order, but on Wednesday

Me too, Anna, but on Friday my time (=Thu pm US EST time), after seeing four of the words (dekko, ait, bijou, horst). For me, it was the "rst" sequence that did it.

I am impressed that you and bridget96 spotted an alphabetical pattern after only 3 and 2 (!!) words respectively.

In my response to Anu, I wondered about the longest English word that conforms to the rule (suggestions, anyone?), and also mused about sentences or passages of text made up entirely of conforming words (a bit like the "missing letter" challenge in another thread).