Difficult

At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.

What tree that definitely grows does not have a shadow and does not grow fruit?

Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.

At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.

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