"Right. Hello, Doctor," Billy nodded, a faint little smile of recognition on his face. With that much enthusiasm for a little puzzle, how could the man possibly be anyone else? Among the many versions of Jamie's mentor and friend he'd met, that never changed. "I'm Billy. Just in case you need a name at some point."

He watched the solution, slapping his forehead after the second square. "Of course. Enclosure doesn't necessarily have to be contiguous...right."