A man is riding a bike on a steep tilt.
A man is riding a bike.
'riding a bike'  implies ' riding  a bike'.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_tilt(x3) & a_steep(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_man(x1))