Actually, hereami, it says that "these are the generations", meaning that it just laid out the generations for us to see.
"Generations" doesn't always mean there was a prior ancestry. Look at the "generations of Adam", he had no human father. He was created by God, yet the Bible starts with him and goes on down the line, and calls it his generations. It all depends on the context, and here that is that the generations are laid out for us to see.
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