Unless neither John nor Harry eat the pancake, Andrew must eat it.
Can someone help me understand the above sentence's meaning?
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...neither John nor Harry eat the pancake...
John does not eat the pancake and Harry does not eat the pancake.
If the thing following does not happen.
So the sentence as written makes no sense. It states that Andrew must eat the pancake if either John or Harry has eaten it.
I would bet good money that the writer meant
Unless either John or Harry eats the pancake, Andrew must eat it.
If neither John nor Harry eats the pancake, Andrew must eat it.