The back of the letter held a pattern resembling a QR code, though it was different in some ways. Countless zigzag lines and small squares were arranged in chaotic disorder, printed with exquisite precision.
Song He was stunned. It was obvious that this was some kind of pattern used for secrecy—a graphical cipher.
He had never studied anything like this. But since Lao Zhao had sent it, did that mean he thought Song He could decipher it?
Could it even be an exam question? Solving it would prove that his mathematical abilities were solid enough for him to serve as a Young Talent Award judge, while failing to solve it and being unable to reply would mean he was unqualified?
Interesting.
Song He raised the letter and carefully examined the pattern, studying the connections between its parts before looking at the overall arrangement. He tried converting it into numbers, treating the different zigzag lines and squares as operators, and converting between different bases...
His expression turned astonished. This tiny pattern truly contained endless variations. It was practically a cipher belonging exclusively to mathematicians; non-mathematicians could forget about making any sense of it!
Mathematics Progress detected. Grandmaster Level 05 upgraded to Grandmaster Level 06!
A trace of enlightenment appeared in his eyes. After pondering for a moment, Song He grabbed his phone and made a call.
The Experiment Building of the Brain Science Institute, at the entrance.
Lou Jinghui staggered out the door. Working overtime continuously had left him mentally and physically exhausted. If he had not been afraid of ending up in the campus news, he would even have lain down in the roadside grass and slept soundly.
He straddled a bicycle, but before he could even pedal, the phone in his pocket vibrated.
Lou Jinghui's expression