Figure 1. Picture of a cactus. The cactus has other plant debris stuck in its thorns, was taken at Balboa park. "Balboa Park. Mostly I visted the cactus garden this day..." by Spifferella at flickr https://www.flickr.com/photos/saynathespiffy/44363336205/in/photostream/ shared under a creative commons (CC BY-NC-SA 2.0) license.
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