The fishing boat backed out of Cave 6.
Asarina seemed alright, but the teacher was in worse condition. Perhaps due to his age, he appeared half-conscious and lethargic.
The boat stopped in front of seven cave entrances.
Pan Xiaoxin looked uncertainly at Bai Youwei. "Sister Weiwei, which cave should we enter this time?"
They had already passed through Cave 4 and Cave 2. Now, Cave 6 was impassable, they had to make a choice again.
Bai Youwei studied the caves and asked Pan Xiaoxin, "Xiaoxin, do you see a pattern between 4 and 2?"
Pan Xiaoxin paused, "They're both even numbers, and then... there's only one digit between them?"
Bai Youwei said, "Counting from right to left, there's a 3 between 4 and 2. If the pattern holds for the next cave, counting forward from 2, which cave should we choose?"
"...7?" Pan Xiaoxin hazarded uncertainly.
Asarina asked, "Are you sure about 7?"
