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A hair stylist arranges a model's hair as other stylists watch during the preparation backstage for the catwalk presentation of summer collection designs by Lenny at Fashion Rio in Rio de Janeiro, Brazil, Friday, May 25, 2012. (AP Photo/Victor R. Caivano)

Bountiful bikinis at Rio Fashion Week

Just how many variations can you spin off a simple two-string bikini? Judging by the options on display at the summer 2013 fashion extravaganza in Rio de Janeiro, the options are endless.