The other day I came across どうたら and while looking it up I noticed that たら is classified as a particle. どうたら is apparently an abbreviation of どうたらこうたら, so I see that it should work for ああ and そう (by the way, what are these called?), but I'm having a hard time imagining how else it is used.
どう and こう replace verbs here. -たら is a particle that attaches only to verbs and i adjectives. It means something like "do this, do that".
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