collision.theory: P1030580
collision.theory: P1030578
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collision.theory: P1030563
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collision.theory: P1030561
collision.theory: P1030559
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collision.theory: P1030557
collision.theory: P1030555
collision.theory: P1030553
collision.theory: P1030550
collision.theory: P1030548
collision.theory: P1030547
collision.theory: P1030545
collision.theory: P1030544
collision.theory: P1030541
collision.theory: P1030540
collision.theory: P1030539
collision.theory: P1030536
collision.theory: P1030534