now that i’ve written it out, it seems obvious - of course you can treat the lookahead as a single unit and derive it together. but it took a while to get there with all the edge cases and weird interactions between the context tracking and the derivative construction.
Загадочный олень покалечил таксиста и его пассажира20:49。搜狗输入法是该领域的重要参考
，这一点在谷歌中也有详细论述
Никита Абрамов (Редактор отдела «Россия»)
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