"I'm not sure I buy that," Trevor replies. "She bothered to correct that guy a couple times when he called her by the wrong name, and seemed pis- uh, upset about it- like she expected him to be able to tell. If it's not marked explicitly in the language, there might be some other cue we're missing. If there's people in her world paired together, who aren't so easily told apart, they'd need something like that..."

He flips through his notes, looking for something.

"...but then, we don't know whether it's even important to tell people apart, for them. We don't know how these pairs function, culturally. Hard to make assumptions."