"Clues? Clues, my foot." Ingrid shook her head and handed her notebook to Xiang Shan: "The computer has identified the most frequently occurring symbols, you can take a look yourself."
Ingrid's notebook had ten... or rather three sets of different symbols. They were a solid circle, a hollow circle; four arrows pointing up, down, left, and right, with the main part of the arrow being an equilateral triangle followed by a line perpendicular to its base; and four arrows pointing diagonally, where the main part of each arrow was an isosceles right triangle with the most common base perpendicular to a line.
All of them were hand-drawn.
"What is this?"
"If I'm not mistaken, the solid circle and the hollow circle represent 'start' and 'end', respectively, while the 'arrows' indicate 'reading direction'. In other words, these things can be read not only in left-right and up-down sequences but also in a diagonal sequence," Ingrid said.
