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![Limited Edition!! Black T-Shirt Front ["In physics, jounce or snap is the fourth derivative of the position vector with respect to time, with the first, second, & third derivatives being velocity, acceleration, & jerk, respectively; in other words, the jounce is the rate of change of the jerk with respect to time.--math.stackexchange.com] I Take A Nap, Digital Prints, Mexico, Unisex, Sleeves, Mens Tops, T Shirt, Cotton](https://i.pinimg.com/236x/89/4d/d3/894dd30f3b47fd292bdfa099faa602e9.jpg)
