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"each sentence has its own unique meaning" is both too fine-grained (some sentences mean the same as each other) and too coarse-grained (because of ambiguity and context). Some careful version of this claim might be true, but as written it is either vague, wrong or both.
it could indeed have been sharper, it was a brief quote drawn out of context from a brief popular essay. the whole of chapter 4 of http://rebooting.AI makes elaborates what we mean by understanding, and central chapters of algebraic mind spell out the prediction’s logic.
