Although there is no hint on the inner wall of the wardrobe, the innermost cabinet against the wall feels much thinner than the other cabinets.

Generally speaking, in order to save materials, the innermost cabinet wood is very thin.

This makes sense.

Qin Yuanyao flexed her fingers again and tapped on the cabinet.

When you knock on the innermost cabinet, the sound sounds much empty, and the sound of knocking on other cabinets sounds deeper and more solid.

Qin Yuanyao was wondering, and suddenly heard Chi Baiyi's voice.

"Come and see, is this the direction the girl's left hand is pointing?"

Qin Yuanyao and Chi Cheese didn't find any useful clues in the cabinet, and when they heard Chi Baiyi say this, their attention was attracted away.

Qin Yuanyao went to Chi Baiyi's side and measured the direction of the girl's left hand with her gaze, which was indeed on the bookshelf.

"Is she referring to a book?" Qin Yuanyao said suspiciously.

In the same way, she used her fingers to draw straight lines of nothingness in the direction of the girl's left hand.

Eventually, her fingers, drawing straight lines, touched the book "The Female Commandment".

Qin Yuanyao looked surprised and confused: "Is she referring to this book?" ”

Chi Baiyi's eyes were deep: "Let's take a look first." ”

The book is still brand new, with no markings in it, no signs or marks of anyone else looking at it.

Qin Yuanyao flipped the book from beginning to end, and did not find the slightest clue.

"No clues." Qin Yuanyao said to Chi Baiyi: "Could she be referring to other books?" ”

"Take a look at all the books in the neighborhood." Chi Bai said.

Qin Yuanyao and Chi Baiyi took out all the books around "The Female Commandment" and flipped through them.

Pool cheese helped them turn it over.

Nine or ten books were read by them from beginning to end, and there was still not the slightest clue.

"Could she be referring to the bookshelf in the back?" Qin Yuanyao thought again.

"We went through both shelves of books before and didn't find any clues." Chi Bai said.

"Is it possible that we didn't take it seriously enough and missed something?" Qin Yuanyao said.

Since the girl's fingers are pointing in this direction, it is most likely useful.

Qin Yuanyao could only think about whether it would be because they didn't turn it seriously enough and missed something, so they didn't find any clues.

Chi Baiyi understood what Qin Yuanyao was thinking.

He bowed: "Let's go through it again." ”

They first flipped through the books on the back shelves in the direction the girl pointed out, and after nothing they had gained, they expanded their range.

At the end of the day, they basically re-read all the books on both shelves.

[It's too hard! It's so hard! Seeing Yaoyao and them flipping so many books from beginning to end, I felt that it was so difficult.

[Are the clues really in these books?] They're going to be in the wrong place.]

[Alas, who knows.] Before the password is unlocked, no place can be missed, there may be clues]

[I see that the other four groups of guests are also not going well]

[The program team made a big move this time. I don't want them to come out easily, so I deliberately delay their time.

"No clue......" Qin Yuanyao sat on the bench a little tired.

Chi Cheese nodded his little fluffy head, and his little face was solemn: "Yes, it's so difficult!" ”

Chi Baiyi revisited the painting and the wall calendar.

"Paintings and wall calendars should be hints, especially the four strings ......of numbers," Chi Baiyi muttered: "What does the direction of the girl's finger have to do with the calendar and numbers?" ”

Qin Yuanyao also looked at the paintings and the wall calendar.

The girl pointed to the closet, and there was nothing in the closet. The other pointed to the bookcase, which is the book...... What do those four strings of numbers have to do with the book? ”

Chi Baiyi continued her words: "The structure of the four strings of numbers is the same, and the first four numbers are also the same, is there any rule?" ”

Chi Cheese's soft little hands supported his cheeks, and his face was also full of sadness.

She said like a little adult: "What will be the pattern?" ”

All three were silent.

Chi Cheese felt that if her parents couldn't think of it, then she couldn't think of it as a child.

She was tired of supporting her cheeks, put down her hands, and was about to sit upright, when her eyes slid over the book on the table.

There is a book that is backside up.

Chi Cheese's gaze slid over the string of numbers in the lower right corner of the book, and she froze.

She stared at the numbers several times, and then she slipped out of her chair and ran to the calendar, looking at the four numbers on the calendar, and silently comparing them in her mind.

After the comparison, Chi Cheese shouted happily: "Sister Qin! Father! These four strings of numbers and the numbers on the back of the book are like yo! ”

Qin Yuanyao and Chi Baiyi were both stunned.

They took the nearest book and flipped to the back of it.

Sure enough, in the lower right corner of the book, there is a string of numbers.

Qin Yuanyao took the numbers on the back of the book and compared them with the four strings of numbers on the wall calendar, and immediately understood.

"ISBN! The number in front is the book number! ”

[What?? What is the ISBN? 】

[When the editor of this book saw the four strings of numbers, he felt that the strange (covering his face) was really the book number (covering his face)]

[To the previous sister science, the book number is the book number assigned by the General Administration to various publishing houses, if you want to publish a book, the book number is indispensable, if not, it is not allowed to be sold at a fixed price. The book number is generally on the back of the book, which is the string of numbers and barcodes.

[I took a book and looked at it, it's really a book number!] 】

[If you weren't in the publishing industry, you wouldn't have thought it was a book number.] The cheese is amazing! 】

[Yes, like me, although I like to buy books, I don't go out of my way to see what the book number is. The observation power of cheese is really good! 】

"978-7-3356-1345-3, all the way to this is the book number, and I don't know what the number behind it is." Qin Yuanyao said.

Chi Baiyi was also prompted by Chi Cheese, and he had already reacted that the front of these number strings was the book number.

"Let's find out the four corresponding books according to the book number."

"Good!" Qin Yuanyao and Chi Cheese both responded.

They worked together and quickly found the books corresponding to the four book numbers.

"But what's the number after the book number?" Pool Cheese tilted her head and asked cutely.

Chi Baiyi and Qin Yuanyao thought about each other, and neither of them spoke.

[Come on, come on! The book number has been guessed, the book has been found, and it must be very close to the answer! 】

[The following numbers should be related to the corresponding book, right?] 】

[I think it's mostly related, otherwise why would they bother with Bala's guessing number]

[The guests of the other groups still have no clue, but Mr. Feng and his family are slightly ahead, and they feel that they are getting closer and closer to the password. Yaoyao, they are almost about to see the dawn! 】

Chi Baiyi's eyes flashed, and he had an idea.

(End of chapter)