Avid bikers riding indoors.
An indoor motocross race takes place.
Avid bikers does not imply a motorcross race takes place.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_indoor(x3) & (x1 = x2) & n_biker(x1) & a_avid(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_take(e1) & n_place(x3) & n_race(x1) & of(x1,x2) & n_motocross(x2) & a_indoor(s1) & Theme(s1,x1))