The fishing boat backed out from the 6th hole.
Asha Lina's condition is not bad, but Teacher Cheng is a little worse. I don't know if it is because she is relatively old, she is half awake, and she is not in good spirits.
The boat stopped in front of the seven caves.
Pan Xiaoxin looked at Bai Youwei uncertainly: "Sister Weiwei, which hole shall we enter this time?"
They have passed No. 4 and No. 2, and now No. 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 rule do you think exists between 4 and 2?"
Pan Xiaoxin was stunned for a while, "It's all even numbers, and then... there's only one digit in between?"
Bai Youwei said: "Counting from right to left, there is a 3 between 4 and 2. If the next cave is the same, counting from 2 to the front, which hole should we choose?"
"... 7?" Pan Xiaoxin said uncertainly.
Asha Lina asked, "Is there a good grasp of 7?"
"It's hard to say." Bai Youwei lowered her eyes and said in a low voice, "Just now under the boat, I saw the pattern of ouroboros printed on the boat, there are seven in total. Snakes will be attacked by mermaids."
Pan Xiaoxin never got off the boat and didn't see those patterns. Hearing Bai Youwei's words, he suddenly realized:
"Understood, seven ouroboros correspond to seven caves, is that so, Sister Weiwei?"
Bai Youwei nodded slightly, gave a low "um", and said, "No matter how we choose the seven caves at the beginning, we will never encounter mermaids, because we are in the position of snake heads, and every snake head can protect us. It is safe, but once we go deep and enter the snake’s belly, it means that we have chosen a looped closed path, and we must follow the path corresponding to the ouroboros, otherwise we will lose our protection.”
Aaron couldn't help but ask: "But how can we know the corresponding path of that snake? Are there any hints in the pattern?"
This is the most difficult place for Bai Youwei.
Because the pattern on the boat is a group of snakes intertwined, and the light is too dark, it is really difficult to see the details, and with the several attacks of the mermaid on the boat, the pattern has been severely damaged, and the iron sheets have peeled off in some places.
"The paths corresponding to each ouroboros should have their own rules... I can't see any obvious hints, but their colors are all black and red, a section of black and a section of red, if the head is black, then the tail It has to be red, the colors just cycle."
Ashaline thoughtfully said: "If the order of holes is also cycled like colors, enter the 4th hole, push two numbers forward and it's number 2, then number 7, number 5, number 3, number 1, No. 6, No. 4, we need to make a total of 8 holes to loop back to the original No. 4 position.”
Bai Youwei nodded: "That's what it means."
After a pause, Bai Youwei said again: "Counting from right to left, 4 and 2 are separated by a number, and counted from left to right, 4 and 2 are exactly four numbers apart."
1-2-3-4-5-6-7.
Asha Lina nodded when she heard the words, "Understood, what you mean is that the number of holes is selected at the beginning, and the number of intervals for the next hole is selected. If we start with the number 1 hole, then the next hole is selected. The hole is a 3, followed by a 5, 7, 2, 4, 6, 1, again eight times to complete a cycle."
"This is just a possibility of regularity." Bai Youwei's voice lowered, "Whether you should choose a cave according to the color prompts, tell me your opinion."
Asha Lina thought for a while and looked at Aaron: "Go down and see how many color blocks are there in the colors on those Ouroboros."