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Amazon.com : Ab Solo - Abdominal Exercise Machine, Patented Ball Return Design, Touch Targets, Repetition Counter, Training Balls Included (Black) : Sports & Outdoors
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File:Balls and sticks model of AB stacked graphite with other layer stackings.svg - Wikimedia Commons
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PASTORELLI HIGH VISION Glitter Ball - Silver AB | Rhythmic Gymnastics Gym Balls FIG Approved | Pastorelli Sport Rhythmic Gymnastics Store
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