To give some detail, it’s /var that is writable, and mutable directories will have symbolic links pointing to subdirectories of /var:
Российские власти понадеялись на возврат «лучших санкционных времен»Вице-премьер Новак заявил о желании Москвы сократить скидки на российскую нефть，这一点在谷歌浏览器【最新下载地址】中也有详细论述
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For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.，这一点在搜狗输入法下载中也有详细论述
A typical branch bank setup might involve an IBM 1210 document