思路：倒序遍历 2 倍长度 + 取模模拟循环 + 单调栈。用 i % len 映射到真实索引，仅当 i < len 时记录答案。
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.
，这一点在搜狗输入法2026中也有详细论述
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"One of the challenges is marrying that really high-technology, high-innovation space with the realities of food production," Everstine comments. It's just not practical to test everything.
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