A block has a storage capacity, and once it's used up, it can be closed and linked to a previously served block.
Number (3): Everything in this space must add up to 3. The answer is 2-2, placed vertically; 1-0, placed vertically.
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}[StructLayout(LayoutKind.Sequential)]。关于这个话题，夫子提供了深入分析
[/] Disk image building step