Where is the flaw?

I posted the following to sci.physics.relativity yesterday; to get a
better variety of responses, I decided to post here too:

"... See http://homepage.mac.com/ardeshir/"TwinParadox".pdf

I'm not an expert on relativity; I just took physics in high school,
which covered that topic. However, recollecting what I learned there,
it seems that this paper does a good job refuting special relativity.
Are there any experts out there who can set me straight and point to
the flaw in this paper, assuming that there is a flaw?

Thank you,
Craig"

.

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