The fishing boat came out backwards from hole 6.

Azalina's condition is fine, Teacher Cheng is a little worse, I don't know if it's because she is older, a little half-conscious, and her spirit is not good.

The boat stopped in front of the seven caves.

Pan Xiaoxin looked at Bai Youwei uncertainly: "Sister Weiwei, let's ...... this time Which hole to enter? ”

They have already passed 4 and 2, and now 6 is not passable, and they have to face the choice again.

Bai Youwei looked at the cave in front of her and asked Pan Xiaoxin: "Xiaoxin, what do you think is the rule between 4 and 2?" ”

Pan Xiaoxin was stunned, "It's all even, and then ...... Only one digit in between? ”

Bai Youwei said: "Count from right to left, there is a 3 between 4 and 2, if the next cave is also this law, count from 2 to front, which hole should we choose?" ”

“…… 7？ Pan Xiaoxin said uncertainly.

Azalina asked, "Is 7 too sure?" ”

"It's hard to say." Bai Youwei lowered her eyes and whispered, "Just now under the boat, I saw the pattern of the Ouroboros printed on the boat, a total of seven, and near the Ouroboros is the pattern of a mermaid, as if it was ...... Once you leave the Ouroboros, you will be attacked by merfolk attacks. ”

Pan Xiaoxin never got off the boat, and he didn't see those patterns, and after listening to Bai Youwei's words, he couldn't help but suddenly realize:

"Understood, seven Ouroboros correspond to seven caves, is that so, Sister Vivi?"

Bai Youwei bowed her head slightly, said with a low "um", and said: "In the first seven caves, no matter how we choose, we will not encounter mermaids, because we are in the position of the head of the snake, and each head of the snake can ensure our safety, but once we go deep and enter the belly of the snake, it is equivalent to us choosing a closed path in the shape of a ring, and we must follow the path corresponding to the Ouroboros, otherwise we will lose protection." ”

Aaron couldn't help but ask, "But how can we know the path of that snake?" Is there a hint in the pattern? ”

This is the most difficult part of Bai Youwei.

Because the pattern on the boat is a group of snakes entwined, and the light is too dim, it is really difficult to see the details, and with several attacks by the mermaid on the boat, the pattern is very badly damaged, and the iron sheet has peeled off in some places.

"The path corresponding to each Ouroboros should have its own rules...... I don't see any obvious hints, but they are all black and red, one black, one red, and if the head is black, then the tail must be red, and the color is exactly circulating. ”

Azalina thought: "If the order of hole-in-hole is also cyclical like the color, enter hole 4 and push two numbers forward to be number 2, then number 7, number 5, number 3, number 1, number 6, number 4, and we need to go into the hole a total of 8 times to cycle back to the original number 4 position. ”

Bai Youwei nodded: "That's what it means." ”

After a pause, Bai Youwei said again: "Count from right to left, 4 and 2 are separated by one number, and count from left to right, 4 and 2 are exactly four numbers apart." ”

1-2-3-4-5-6-7。

Azalina nodded, "I see, you mean that the number of holes is selected at the beginning, and the number of intervals is selected for the next hole." If we start with hole 1, the next hole is 3, followed by 5, 7, 2, 4, 6, 1, again through eight cycles. ”

"It's just a possibility of regularity." Bai Youwei's voice lowered, "Do you want to choose a cave according to the color prompts, and tell me what you think." ”

Azalina thought for a moment and looked at Aaron: "You go down and see how many color blocks there are on those Ouroboros." ”