* @param {number[]} nums1 - 待查询的数组（元素均为nums2的子集）
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But of course, like any immutable system, there are mutable parts (otherwise, we couldn’t create any configuration files). OSTree handles this with “overlays” (actually, we use OverlayFS) that allow a read-write filesystem to be layered on top of the immutable system. For example, the /etc and /var directories are writable, while the rest of the system is read-only.
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The developers are well aware that both projects may still be unfinished 10 years from now, but most are just working toward the next release.