premise: A racing motorcycle rider has fallen off his bike and is sliding on the ground while another rider is driving behind.
hypothesis: There are at least two riders.
explanation_1: Motorcycle rider while another rider is driving are at least two riders.
explanation_2: Racing motorcycle rider and another rider are at least two riders.
explanation_3: Sentence 2 explains that there were at least two riders in the scenario of a racing motorcycle rider.
premise_logic: exists e1 e2 p1 x1 x2 x3 x4 x5 x6 x7 x8.(n_ground(x8) & exists e3 s1 x9.(a_behind(s1) & Manner(e3,s1) & Actor(e3,x9) & v_drive(e3) & n_rider(x9) & -(x9 = x1)) & n_rider(x1) & n_rider(x1) & while(e2,p1) & on(e2,x8) & Actor(e2,x5) & v_slide(e2) & n_rider(x5) & of(x5,x7) & n_motorcycle(x7) & of(x5,x6) & n_racing(x6) & off(e1,x4) & n_bike(x4) & of(x4,x1) & n_male(x1) & Actor(e1,x1) & v_fall(e1) & of(x1,x3) & n_motorcycle(x3) & of(x1,x2) & n_racing(x2))
hypothesis_logic: exists p1 x1 s1 x2.(at(x1,x2) & r_most(s1) & a_least(s1) & Theme(s1,x2) & n_rider(x2) & card_eq_2(x2))