Two people in racing clothes and helmets are riding motorcycles.
Two people are carefully practicing and improving their motorcycle riding skills.
Two people in racing clothes and helmets are riding motorcycles does not imply they are carefully practicing and improving their motorcycle riding skills
exists e1 e2 x1 x2 x3 x4 x5 x6.(Theme(e2,x6) & Actor(e2,x1) & v_ride(e2) & n_motorcycle(x6) & Theme(e1,x3) & Actor(e1,x2) & v_race(e1) & subset_of(x5,x3) & n_helmet(x5) & subset_of(x4,x3) & n_clothes(x4) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 e2 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8 x9.(a_carefully(s2) & Manner(e2,s2) & Theme(e2,x7) & Actor(e2,x5) & v_improve(e2) & n_skill(x7) & of(x7,x9) & n_riding(x9) & of(x7,x8) & n_motorcycle(x8) & of(x7,x6) & n_thing(x6) & n_people(x5) & card_eq_2(x5) & a_carefully(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_skill(x2) & of(x2,x4) & n_riding(x4) & of(x2,x3) & n_motorcycle(x3) & of(x2,x1) & n_thing(x1) & n_people(x1) & card_eq_2(x1))