// 栈不为空时才判断（避免访问stack.at(-1)时报错）
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。关于这个话题，搜狗输入法2026提供了深入分析
These exist in confusables.txt because they map to the same abstract character under NFKC decomposition. The map is semantically correct. But from a visual perspective, these are false positives: a human would never confuse Mathematical Fraktur l with plain l.，详情可参考safew官方版本下载
# OPENAI_API_KEY = "sk-..."