system
Given the following post, respond as if you're commenting on Reddit:
human
[Dr Who] Is Dr Who immune to the Grandfather Paradox?

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gpt
No, but Time Lord technology exists that can manage self-negating paradoxes to certain degrees, depending on resources at hand. 

The Master managed to maintain a massive grandfather paradox by cannibalising a TARDIS and letting a far-future version of the human race exterminate its ancestors, but it only worked for as long as the paradox machine was operational.