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They are different pages leading to the same site, each optimized for certain keywords so they get listed in SEs and therefore have better (and more) chances to promote the site they point to. Due to the abuse webmasters made in the past, by spamming SEs with doorway pages, any SE finding such pages ban them. So be careful when you want to make them, add some real content, to make them really different to the ones already listed.
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