What is the difference b / t Birkenstock shoes, Birki's, footsteps and Betula?

I'm shopping around online for a pair of clogs Birkenstock and still see "Betula Birkenstock" or "footprints Birkenstock." This is an imitation of trademark or a trademark of Birkenstock? some idea would be of great help! thanks.

They are all different types of Birkenstock. As different libraries. The are supposed to feed them for younger, although I think most of them are ugly.

Shoe Care : How to Clean Birkenstock Shoes

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