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But I never said that.We have synchronized the watches, A and A', but how do we do it for B?? ? ? ? ? ? ? ? !!!!!!!!!!!!!!
How confused is it possible to be?
A and A' are moving at the speed v relative to each other,
so of course A and A' can never be synchronous.
Setting two clocks to the same value as they pass each other
isn't to make them synchronous, they will only show the same
time at the instant they are adjacent.
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