Since we were familiar with the place, we went in and walked up to the third floor without looking at the sign above. This is the floor with the largest number of applied books, including a large number of books on specialized subjects.

Ouyang Qian ran directly to the psychology area and began to look for the book she wanted to read, I didn't have anything I wanted to read, so I simply followed her and began to think about the meaning that the string of numbers might mean.

S27e1205152018, what kind of meaning will such a long string of numbers express?

First of all, according to cryptography, if a person wants to add a certain message to another person in a password, then he will first write a few things to confuse people, and then hide what he wants in it and wait for another person to crack the code.

However, if another person wants to crack this password, he must need one thing, that is, to find the correct ones from this huge amount of spam passwords, and arrange them in the correct order to get the real information. This thing is called a "key".

A key is not a key, but a method. It is the person who needs this information to be taught to follow the idea that the key tells you to properly dispose of that huge file, so as to find out the mystery hidden in it.

If you follow this line of thinking, then there may be a few numbers in this string of numbers that are spam and have no effect. At the same time, if I want to decipher the meaning of this string of numbers, I should need to find a corresponding "key".

I smiled bitterly, how could this be. Perhaps, the person who wants to convey this message doesn't want me to know this message at all. Otherwise, how could he just give me this strange number and let me analyze it alone.

It seems that discussing this number through the lens of cryptography should not work.

So, secondly, I started another job in my head, which was to select the "element group". The so-called "element group" is actually a linguistic concept. In a sentence of a language, words used to express similar concepts are often grouped together as a separate "group of elements".

This is also the method of how to break sentences that we learned from our Chinese teacher when we were children.

For example, a sentence: I like this girl.

In this sentence, the group of elements should be divided into four: "I", "like", "this", and "girl". Because these words are combined, it is impossible for us to read them apart when we read this sentence, otherwise we will lose the meaning we want to express and make others unable to understand it.

Therefore, if you can consider it from this aspect, this string of numbers does not seem so untraceable.

There are two letters in front of the number, s and e, and I can combine them with the numbers that follow them to form two groups of elements: "s27" and "e12". Of course, this is just one of my assumptions at the moment, and the number followed by the letter e may also be 120, or it may be 1205, and so on.

I came back to my senses, I needed a pen and a piece of paper, and I had to make a draft of this thing. I turned around and saw that Ouyang Qian was gone, so I walked around, looking for her, and then I saw her where there was a table on this floor, and she was sitting on a chair, reading with relish.

Seeing her study so seriously, I felt a little gratified. I walked over and patted her on the shoulder, and she came back from her reading state and looked at me with a little chagrin, as if to reproach me for interrupting her reading train of thought.

I couldn't help but smile. It's revenge on you.

"Xiaoqian, you study here, I'll go somewhere else to take a look." I leaned into her ear and whispered. At this time, the surrounding tables were full of people reading, and I didn't dare to make a loud noise here.

She waved impatiently at me, then continued to look. I shook my head helplessly, then went to the first floor and asked the staff at the counter for a piece of paper and a pen.

When I got to pen and paper, I found a random place to sit and began to study my numbers.

I wrote on paper several possible ways to group groups of elements, and the one that I felt was the easiest to divide was the four numbers at the end: 2018. If I'm not mistaken, this is probably the year 2018, this year, of course, this year.

But while it was obvious, I didn't make a decision lightly. Since the combination of the first few numbers and letters is really not easy to determine, it is likely that the four numbers of 2018 at the end of this will also be connected with the previous numbers, telling me a specific code.

After a while, the whole sheet of paper was scribbled by me, and I stood up in frustration and threw the paper full of my drafts into the trash can next to me.

Alas, I don't want to think about it, it would have been easy to finish the case, so why play such a meaningless game again. What's more, I don't even know who wrote this string of numbers to me now, and what purpose it is, so what's the point of launching it.

With my hands in my pockets, I began to walk around boredly, flipping through the books on the shelves, and maybe it would give me some inspiration.

This shelf is full of geography-related books, and I flipped through a few of them, which I found boring, and finally simply picked up an atlas and started reading.

This is an atlas of tourist guides, about some of the places to visit in France. That place is beautiful, what is delicious, what kind of wine estate are you going to drink......

To be honest, I've never been very interested in things like travel, especially those who desperately want to go abroad to see, in the words of some old people, to spend money to suffer.

I was about to close the atlas when I suddenly saw a map of the world printed on the back of the atlas, although it was not big, but it was full of all kinds of information, and it could be said to be very comprehensive. In the interest of fun, I began to look for the geographical location of the city of S on this map, and then looked at other places with great interest.

Equatoral, Tropical Subtropical, Arctic Circle, Antarctic Circle, Northern HemisphereSouthern Hemisphere...... The entire map is staggered by warp and weft lines, like a watermelon that has been cut by several knives, turning into squares. If I'm not mistaken, our geography teacher in junior high school forced us to be ...... by these things every day