What does "The first three follow" mean?
"The first three follow from what we have said so far. The last is perhaps less obvious, but also important."
Four things have been mentioned. "The first three" refers to the first three of these things. "The last" refers to the fourth thing.
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Four things have been mentioned. "The first three" refers to the first three of these things. "The last" refers to the fourth thing. "follow from" means "are a logical consequence of".