"I know you would," she says. "But you can't. Nobody can. And for me, that's harder than the differences between you." They're subtle and not numerous and she doesn't care about that anyway--it would be creepy, she thinks, if the two Jacks were exactly the same, if they were interchangeable, like parts in a machine... or a Replicator. She tilts her head into his touch and sighs. She's tired of losing people. Jack, most of all, but she's tired of losing everyone.