"Are you done?", Caro asked, looking at his notebook.

"Almost," the boy replied, scribbling furiously.

"What about you?", she asked, turning to his brother. "Are you done, I... you're Ian, right?"

"N. Moses."

"Okay. Ian, Moses... Ian, Moses... Ian, Moses," she recited in a bid to remember who was on her left and who was on her right. "So how can I tell who's who after you both leave here?"

"He's the stupid one," Moses said, pointing at his twin.

"He's the ...