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2.1.7 Non-delete of last block in the chain

We currently do not support deletion of the last block at any level, that is, the one with the end-of-block key. This is because this deletion requires special case to retain the end-of-block key. One way to achieve this is to copy forward the contents of the next-to-last block, and deleting that instead. [There are details to be worked out, eg. preservation of correctness during this operation.]