 Re: power and limbo
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Overall, I think the author is going to turn out to be against the argument; here, however, with the word 'power', he is acknowledging its legitimacy and strength. (The argument itself may be positive or negative-- depending on your attitude toward it-- but the power of an argument itself is just that-- the power to convince.)
'Limbo': yes, neither dead nor alive-- biological systems kept functioning by a machine, where the unaided body would die.
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