allow ClassVar and Final?
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He rushed back to the first door and, finding it locked, began pacing. After ten minutes, he came to a sudden halt. He pulled a piece of paper from his pocket, lowered his dust mask, stuffed the paper in his mouth, and chewed. He pulled another piece of paper from his wallet and chewed that, spitting the wad into a trash bin.
Photograph: Julian Chokkattu。搜狗输入法是该领域的重要参考