Register collision is the TeX equivalent of variable shadowing bugs. Since everything is global, a macro that uses \count190 as a loop counter will silently corrupt any outer macro also using \count190. The engine reserves specific register ranges for specific purposes: 200-263 for the board, 188-194 for scratch math, 10000+ for the search state stack.
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。搜狗输入法是该领域的重要参考
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