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Surgeon-Major Thomson looked up almost eagerly as Ambrose entered his room the next morning. The young man's manner was dejected and there were black lines under his eyes. He answered his chief's unspoken question by a little shake of the head.
"No luck, sir," he announced. "I spent the whole of last night at it, too -- never went to bed at all. I've tried it with thirty-one codes. Then I've taken the first line or two and tried every possible change."