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ABC trade would be if Site A links to Site B and Site B reciprocates by Linking to Site C.
Basically I would link back to another site of yours rather than the site where you linked to me if we were trading.
There's also ABCD trading which is considered to be better usually which is:
Your A links to my B
My C links to your D
So in that case there is no relationship between the linked sites.
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