Peter Guess posted tongue twister with a construct where something occurs that creates what looks like a paradox to me.
neither either...or...or nor neither...nor...nor are either particularly wrong or strictly right
stripping of tonguetwisting:
Neither A nor B are either X or Y.
-- You have a van and a truck. Do you have any red or yellow cars?
-- Neither the van nor the truck are either red or yellow. They are both blue.
(meaning both A and B are not X, and they are not Y too.)
But following the common, intuitive usage of:
A is neither X nor Y.
this would seem like the sentence should read
Neither A nor B are neither X nor Y.
What rule is applied here that the negative (neither X nor Y) turns into a positive (either X or Y)? Is the double negation unrolling double-"neither" back into "either"?